Remove unnecessary post-sort assignments

Sorting doesn't change messages, tags or isDirty. They can be changed by
a masterlist update, which may happen during sorting, but the masterlist
update function takes care of updating that data.

src/gui/html/js/events.js

@@ -159,10 +159,6 @@ function onSortPlugins() {
       if (existingPlugin) {
         existingPlugin.crc = plugin.crc;
         existingPlugin.isEmpty = plugin.isEmpty;
-
-        existingPlugin.messages = plugin.messages;
-        existingPlugin.tags = plugin.tags;
-        existingPlugin.isDirty = plugin.isDirty;
       } else {
         existingPlugin = new loot.Plugin(plugin);
       }