Remove duplicate WARN_PRINT macro.

modules/gdscript/gdscript_functions.cpp

@@ -814,7 +814,7 @@ void GDScriptFunctions::call(Function p_func, const Variant **p_args, int p_arg_
 			}
 
 			String message = *p_args[0];
-			WARN_PRINTS(message);
+			WARN_PRINT(message);
 			r_ret = Variant();
 		} break;
 		case VAR_TO_STR: {