fix(upgrade): files_rightclick is deprecated

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

core/shipped.json

@@ -16,7 +16,6 @@
     "files_external",
     "files_pdfviewer",
     "files_reminders",
-    "files_rightclick",
     "files_sharing",
     "files_trashbin",
     "files_versions",
@@ -61,7 +60,6 @@
     "files",
     "files_pdfviewer",
     "files_reminders",
-    "files_rightclick",
     "files_sharing",
     "files_trashbin",
     "files_versions",