fix: fix match error when navigator.product does not exist

`navigator.product` is deprecated and does not exist in some env, breaking `navigator.product.match`

build/emoji.js.template

@@ -601,7 +601,7 @@
 					}
 				}
 			}
-			if (navigator.product.match(/ReactNative/i)){
+			if (/ReactNative/i.test(navigator.product)){
 				self.replace_mode = 'unified';
 				return;
 			}