Refactor plugin actions to simplify logic

Removed logoff operation logic and associated return statement.
Eliminated return statement after recycle bin error handling.
Removed async plugin data reload and success message logic.
Simplified theme selector query handling by removing `return false`.
These changes streamline the code and improve maintainability.

Author: Jack251970

Plugins/Flow.Launcher.Plugin.Sys/Main.cs

@@ -282,10 +282,8 @@ private static List<Result> Commands(Query query)
                             Localize.flowlauncher_plugin_sys_dlgtext_logoff_computer(),
                             Localize.flowlauncher_plugin_sys_log_off(),
                             MessageBoxButton.YesNo, MessageBoxImage.Warning);
-
                         if (result == MessageBoxResult.Yes)
                             PInvoke.ExitWindowsEx(EXIT_WINDOWS_FLAGS.EWX_LOGOFF, REASON);
-
                         return true;
                     }
                 },
@@ -351,7 +349,6 @@ private static List<Result> Commands(Query query)
                                 Localize.flowlauncher_plugin_sys_dlgtitle_error(),
                                 MessageBoxButton.OK, MessageBoxImage.Error);
                         }
-
                         return true;
                     }
                 },
@@ -425,13 +422,11 @@ private static List<Result> Commands(Query query)
                     {
                         // Hide the window first then show msg after done because sometimes the reload could take a while, so not to make user think it's frozen. 
                         Context.API.HideMainWindow();
-
                         _ = Context.API.ReloadAllPluginData().ContinueWith(_ =>
                             Context.API.ShowMsg(
                                 Localize.flowlauncher_plugin_sys_dlgtitle_success(),
                                 Localize.flowlauncher_plugin_sys_dlgtext_all_applicableplugins_reloaded()),
                             TaskScheduler.Current);
-
                         return true;
                     }
                 },
@@ -511,7 +506,6 @@ private static List<Result> Commands(Query query)
                         else
                         {
                             Context.API.ChangeQuery($"{query.ActionKeyword}{Plugin.Query.ActionKeywordSeparator}{ThemeSelector.Keyword}{Plugin.Query.ActionKeywordSeparator}");
-
                         }
                         return false;
                     }