Allow "uninstallation" of bundled plugins

Summary:
Allow "uninstallation" of bundled plugins which means we mark them as uninstalled and not auto-updating anymore. Uninstalled bundled plugins are shown in "Detected in App" section together with Marketplace plugins where user can install them back.

Changelog:
Plugins can be uninstalled from sidebar in new Sandy UI.

Reviewed By: passy

Differential Revision: D25557789

fbshipit-source-id: 751cad68456313c069af639584541086efc7102b

desktop/app/src/store.tsx

@@ -200,6 +200,7 @@ function uninstallPlugin(state: StoreState, plugin: PluginDefinition) {
     unloadPluginModule(plugin.details);
     draft.plugins.clientPlugins.delete(plugin.id);
     draft.plugins.devicePlugins.delete(plugin.id);
+    draft.plugins.loadedPlugins.delete(plugin.id);
     draft.pluginManager.uninstalledPlugins.add(plugin.details.name);
   });
 }