LibCore: Remove overly informal language in ArgsParser error message

Userland/Libraries/LibCore/ArgsParser.cpp

@@ -101,7 +101,7 @@ bool ArgsParser::parse(int argc, char* const* argv, FailureBehavior failure_beha
 
         const char* arg = found_option->requires_argument ? optarg : nullptr;
         if (!found_option->accept_value(arg)) {
-            warnln("\033[31mInvalid value for option \033[1m{}\033[22m, dude\033[0m", found_option->name_for_display());
+            warnln("\033[31mInvalid value for option \033[1m{}\033[22m\033[0m", found_option->name_for_display());
             fail();
             return false;
         }