fix(poweraccent): OnKeyUp normal path now returns true to suppress leaked key-up

Agent-Logs-Url: https://github.com/microsoft/PowerToys/sessions/9113f8c0-d30a-49d8-9f53-6d224cee4910

Co-authored-by: MuyuanMS <116717757+MuyuanMS@users.noreply.github.com>

src/modules/poweraccent/PowerAccentKeyboardService/KeyboardListener.cpp

@@ -282,6 +282,7 @@ namespace winrt::PowerToys::PowerAccentKeyboardService::implementation
                 m_hideToolbarCb(InputType::Char);
 
                 m_toolbarVisible = false;
+                return true;
             }
         }