lib: add missing permissions for patchwork_covercomment_id_seq

Grants UPDATE and SELECT privileges on patchwork_covercomment_id_seq table
for user 'nobody' to fix the following exception when cover comments
are being parsed:
django.db.utils.ProgrammingError: permission denied for sequence
  patchwork_covercomment_id_seq

Signed-off-by: Ali Alnubani <alialnu@nvidia.com>

lib/sql/grant-all.postgres.sql

@@ -94,6 +94,7 @@ TO "nobody";
 GRANT UPDATE, SELECT ON
 	patchwork_comment_id_seq,
 	patchwork_cover_id_seq,
+	patchwork_covercomment_id_seq,
 	patchwork_event_id_seq,
 	patchwork_patch_id_seq,
 	patchwork_patchtag_id_seq,