Revert "Command line arguments '--version' and '--help' return exit code 0 instead of 255"

This reverts commit 9e165a8c2b205f37564e7e0e3e96c1fce52b6622.
See https://github.com/godotengine/godot/pull/62550#issuecomment-1172745325.

main/main.cpp

@@ -478,9 +478,6 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	packed_data->add_pack_source(zip_packed_data);
 #endif
 
-	// Default exit code, can be modified for certain errors.
-	Error exit_code = ERR_INVALID_PARAMETER;
-
 	I = args.front();
 	while (I) {
 #ifdef OSX_ENABLED
@@ -497,12 +494,10 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 		if (I->get() == "-h" || I->get() == "--help" || I->get() == "/?") { // display help
 
 			show_help = true;
-			exit_code = OK;
 			goto error;
 
 		} else if (I->get() == "--version") {
 			print_line(get_full_version_string());
-			exit_code = OK;
 			goto error;
 
 		} else if (I->get() == "-v" || I->get() == "--verbose") { // verbose output
@@ -1333,7 +1328,7 @@ error:
 	OS::get_singleton()->finalize_core();
 	locale = String();
 
-	return exit_code;
+	return ERR_INVALID_PARAMETER;
 }
 
 Error Main::setup2(Thread::ID p_main_tid_override) {