Merge pull request #22644 from nextcloud/fix/license-headers-20-2

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apps/dav/lib/CalDAV/Activity/Setting/CalDAVSetting.php

apps/dav/lib/CalDAV/Activity/Setting/Calendar.php

apps/dav/lib/CalDAV/Activity/Setting/Event.php

apps/dav/lib/CalDAV/Activity/Setting/Todo.php

apps/dav/lib/CalDAV/Schedule/IMipPlugin.php

apps/dav/lib/CardDAV/ImageExportPlugin.php

apps/dav/lib/CardDAV/PhotoCache.php

apps/dav/lib/Connector/Sabre/File.php

apps/dav/tests/unit/CardDAV/ImageExportPluginTest.php

apps/files/lib/Service/OwnershipTransferService.php

apps/files_sharing/lib/External/Manager.php

apps/files_sharing/lib/SharedStorage.php

apps/files_trashbin/lib/Trashbin.php

apps/files_trashbin/tests/TrashbinTest.php

apps/settings/appinfo/routes.php

apps/settings/lib/Controller/ReasonsController.php

apps/settings/lib/Settings/Personal/ServerDevNotice.php

...settings/tests/Controller/AdminSettingsControllerTest.php

apps/settings/tests/Mailer/NewUserMailHelperTest.php