Fix: Move Magic checks from Escape to Unescape Unicode Characters (gchq#2195)

Author: fjh1997

src/core/operations/EscapeUnicodeCharacters.mjs

@@ -44,23 +44,6 @@ class EscapeUnicodeCharacters extends Operation {
                 "value": true
             }
         ];
-        this.checks = [
-            {
-                pattern: "\\\\u(?:[\\da-f]{4,6})",
-                flags: "i",
-                args: ["\\u"]
-            },
-            {
-                pattern: "%u(?:[\\da-f]{4,6})",
-                flags: "i",
-                args: ["%u"]
-            },
-            {
-                pattern: "U\\+(?:[\\da-f]{4,6})",
-                flags: "i",
-                args: ["U+"]
-            }
-        ];
     }
 
     /**

src/core/operations/UnescapeUnicodeCharacters.mjs

@@ -30,6 +30,23 @@ class UnescapeUnicodeCharacters extends Operation {
                 "value": ["\\u", "%u", "U+"]
             }
         ];
+        this.checks = [
+            {
+                pattern: "\\\\u(?:[\\da-f]{4,6})",
+                flags: "i",
+                args: ["\\u"]
+            },
+            {
+                pattern: "%u(?:[\\da-f]{4,6})",
+                flags: "i",
+                args: ["%u"]
+            },
+            {
+                pattern: "U\\+(?:[\\da-f]{4,6})",
+                flags: "i",
+                args: ["U+"]
+            }
+        ];
     }
 
     /**