GroupHead: Remove a redundant call to String.format()

Change-Id: I8f5fc09469b56d73d3838e7bcfecfd21140429eb
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/fnmatch/GroupHead.java

@@ -114,9 +114,9 @@ final class GroupHead extends AbstractHead {
 				characterClasses.add(LetterPattern.INSTANCE);
 				characterClasses.add(DigitPattern.INSTANCE);
 			} else {
-				final String message = String.format(MessageFormat.format(
+				final String message = MessageFormat.format(
 						JGitText.get().characterClassIsNotSupported,
-						characterClass));
+						characterClass);
 				throw new InvalidPatternException(message, wholePattern);
 			}