remove global credentials

apps/files_external/appinfo/application.php

apps/files_external/appinfo/routes.php

apps/files_external/controller/ajaxcontroller.php

apps/files_external/js/settings.js

apps/files_external/lib/auth/password/globalauth.php

apps/files_external/personal.php

apps/files_external/settings.php

apps/files_external/templates/settings.php

apps/files_external/tests/auth/password/globalauth.php