Fix implicit global variable in MessageTemplate partial view

Agent-Logs-Url: https://github.com/grandnode/grandnode2/sessions/1b07a443-a39f-4582-9230-d1c8b6154d69

Co-authored-by: KrzysztofPajak <16772986+KrzysztofPajak@users.noreply.github.com>

Author: Copilot

src/Web/Grand.Web.Store/Areas/Store/Views/MessageTemplate/Partials/CreateOrUpdate.cshtml

@@ -175,7 +175,7 @@
         sendImmediately();
         $(".SearchTokens").on("input", function (e) { SearchTokens(e); })
         $("input").click(function (e) {
-            onInputFocus = $(e.target);
+            var onInputFocus = $(e.target);
         });
     });