feat: Ship downloadlimit

Signed-off-by: Christopher Ng <chrng8@gmail.com>

core/shipped.json

     "federatedfilesharing",
     "federation",
     "files",
+    "files_downloadlimit",
     "files_external",
     "files_pdfviewer",
     "files_reminders",
     "dav",
     "federation",
     "files",
+    "files_downloadlimit",
     "files_pdfviewer",
     "files_reminders",
     "files_sharing",