Remove prototype adjustments in Error subclasses

These `Object.setPrototypeOf` calls are now unnecessary, since our
TypeScript compilation target is set to ES6. From
<https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types>:

> Note: If you don't plan to inherit from built-in types like `Array`,
> `Error`, `Map`, etc. or your compilation target is explicitly set to
> `ES6`/`ES2015` or above, you may skip this section

Author: generalmimon

KaitaiStream.ts

@@ -1038,8 +1038,6 @@ namespace KaitaiStream {
      */
     public constructor(bytesReq: number, bytesAvail: number) {
       super("requested " + bytesReq + " bytes, but only " + bytesAvail + " bytes available");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.EOFError.prototype);
       this.bytesReq = bytesReq;
       this.bytesAvail = bytesAvail;
     }
@@ -1059,8 +1057,6 @@ namespace KaitaiStream {
      */
     public constructor(expected: any, actual: any) {
       super("expected [" + expected + "], but got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.UnexpectedDataError.prototype);
       this.expected = expected;
       this.actual = actual;
     }
@@ -1071,8 +1067,6 @@ namespace KaitaiStream {
 
     public constructor() {
       super();
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.UndecidedEndiannessError.prototype);
     }
   };
 
@@ -1087,8 +1081,6 @@ namespace KaitaiStream {
      */
     public constructor(expected: any, actual: any) {
       super("not equal, expected [" + expected + "], but got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.ValidationNotEqualError.prototype);
       this.expected = expected;
       this.actual = actual;
     }
@@ -1105,8 +1097,6 @@ namespace KaitaiStream {
      */
     public constructor(min: any, actual: any) {
       super("not in range, min [" + min + "], but got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.ValidationLessThanError.prototype);
       this.min = min;
       this.actual = actual;
     }
@@ -1123,8 +1113,6 @@ namespace KaitaiStream {
      */
     public constructor(max: any, actual: any) {
       super("not in range, max [" + max + "], but got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.ValidationGreaterThanError.prototype);
       this.max = max;
       this.actual = actual;
     }
@@ -1139,8 +1127,6 @@ namespace KaitaiStream {
      */
     public constructor(actual: any) {
       super("not any of the list, got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.ValidationNotAnyOfError.prototype);
       this.actual = actual;
     }
   };
@@ -1154,8 +1140,6 @@ namespace KaitaiStream {
      */
     public constructor(actual: any) {
       super("not in the enum, got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.ValidationNotInEnumError.prototype);
       this.actual = actual;
     }
   };
@@ -1169,8 +1153,6 @@ namespace KaitaiStream {
      */
     public constructor(actual: any) {
       super("not matching the expression, got [" + actual + "]");
-      // Workaround https://www.typescriptlang.org/docs/handbook/2/classes.html#inheriting-built-in-types
-      Object.setPrototypeOf(this, KaitaiStream.ValidationExprError.prototype);
       this.actual = actual;
     }
   };