SimpleChatTCRV:Cleanup importmap

Remove the unneeded , wrt last entry

Rather the import map isnt used currently, but certain entries
kept there for future, more as a reminder.

tools/server/public_simplechat/index.html

@@ -14,7 +14,7 @@
                     "simplechat": "./simplechat.js",
                     "datautils": "./datautils.mjs",
                     "ui": "./ui.mjs",
-                    "toolsmanager": "./tools.mjs",
+                    "toolsmanager": "./tools.mjs"
                 }
             }
         </script>