Fix StringUtil#startsWithIgnoreCase

The input was actually being compared to itself
Signed-off-by: Ollie <o.dzineit@gmail.com>

Author: olliestanley

src/main/java/com/flowpowered/commons/StringUtil.java

@@ -41,7 +41,7 @@ public static boolean startsWithIgnoreCase(String input, String prefix) {
             return false;
         } else {
             final char[] inputCharArray = input.toCharArray();
-            final char[] prefixCharArray = input.toCharArray();
+            final char[] prefixCharArray = prefix.toCharArray();
             for (int i = 0; i < prefixCharArray.length; i++) {
                 if (!equalsIgnoreCase(prefixCharArray[i], inputCharArray[i])) {
                     return false;