Fully support `-cp` arguments

The CLI application advertises `-cp` support but it appears that only
`--cp` is really supported. The fix for gh-178 forgot to update the
call to `getParser().parse(...)`.

See gh-178

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

@@ -87,7 +87,7 @@ public class OptionHandler {
 				argsToUse[i] = "--cp";
 			}
 		}
-		OptionSet options = getParser().parse(args);
+		OptionSet options = getParser().parse(argsToUse);
 		return run(options);
 	}