Simplify short literal assignment (#1567)

Author: yuanchaodu

src/test/java/org/apache/commons/lang3/ArrayFillTest.java

@@ -200,7 +200,7 @@ void testFillObjectArrayNull() {
     @Test
     void testFillShortArray() {
         final short[] array = new short[3];
-        final short val = (byte) 1;
+        final short val = 1;
         final short[] actual = ArrayFill.fill(array, val);
         assertSame(array, actual);
         for (final short v : actual) {