Fix CLI help formatting issue with '-cp'

Ensure that '--cp' is replaced with a same length string to prevent
odd help text formatting.

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

@@ -112,7 +112,7 @@ public class OptionHandler {
 			catch (IOException ex) {
 				return "Help not available";
 			}
-			this.help = out.toString().replace(" --cp ", " -cp ");
+			this.help = out.toString().replace(" --cp ", " -cp  ");
 		}
 		return this.help;
 	}