refactor!: remove old dde-dock compatibility files

Signed-off-by: ComixHe <heyuming@deepin.org>

src/dbus/applicationservice.cpp

@@ -43,8 +43,6 @@ void ApplicationService::appendExtraEnvironments(QVariantMap &runtimeOptions) co
         envs.append(it->value<QString>());
     }
 
-    // NOTE: dde-dock need this environment variable for now, maybe we could remove it after we finish refactoring dde-shell.
-    envs.append(QString{"GIO_LAUNCHED_DESKTOP_FILE=%1"}.arg(m_desktopSource.sourcePath()));
     // it's useful for App to get itself AppId.
     envs.append(QString{"DSG_APP_ID=%1"}.arg(id()));