extensionSystem: Set the proper 'enabled' and 'type' parameters

When installing an extension at runtime, we accidentally swapped the 'type'
and 'enabled' parameters. While this doesn't directly affect anything right
now, as everything works coincidentally, future patches that look at the
'type' parameter to decide what to do would get the wrong answer.

js/ui/extensionSystem.js

@@ -202,7 +202,7 @@ function gotExtensionZipFile(session, message, uuid) {
             global.settings.set_strv(ENABLED_EXTENSIONS_KEY, enabledExtensions);
         }
 
-        loadExtension(dir, true, ExtensionType.PER_USER);
+        loadExtension(dir, ExtensionType.PER_USER, true);
     });
 }