Simplify comparator implementation

See gh-9781

Author: emacampolo

spring-boot-cli/src/main/java/org/springframework/boot/cli/command/options/OptionHandler.java

@@ -130,8 +130,8 @@ private static class OptionHelpFormatter implements HelpFormatter {
 
 		@Override
 		public String format(Map<String, ? extends OptionDescriptor> options) {
-			Comparator<OptionDescriptor> comparator = (first, second) -> first.options()
-					.iterator().next().compareTo(second.options().iterator().next());
+			Comparator<OptionDescriptor> comparator = Comparator.comparing(
+					(optionDescriptor) -> optionDescriptor.options().iterator().next());
 			Set<OptionDescriptor> sorted = new TreeSet<>(comparator);
 			sorted.addAll(options.values());
 			for (OptionDescriptor descriptor : sorted) {