Potential fix for code scanning alert no. 5: Incomplete string escaping or encoding

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Live2dHistoire/live2d/js/message.js

@@ -29,7 +29,7 @@ if (!norunFlag) {
 			var tokenReg = /(\\)?\{([^\{\}\\]+)(\\)?\}/g;
 			return template.replace(tokenReg, function (word, slash1, token, slash2) {
 				if (slash1 || slash2) {
-					return word.replace('\\', '');
+					return word.replace(/\\/g, '');
 				}
 				var variables = token.replace(/\s/g, '').split('.');
 				var currentObject = context;