enh: add to shipped

Signed-off-by: Christopher Ng <chrng8@gmail.com>
(cherry picked from commit beb8a27d94)

core/shipped.json

@@ -15,6 +15,7 @@
     "files",
     "files_external",
     "files_pdfviewer",
+    "files_reminders",
     "files_rightclick",
     "files_sharing",
     "files_trashbin",
@@ -59,6 +60,7 @@
     "federation",
     "files",
     "files_pdfviewer",
+    "files_reminders",
     "files_rightclick",
     "files_sharing",
     "files_trashbin",