zoph: Include dbconfig configuration file in backup

- This will ensure that dbconfig is every triggered and regenerates the
configuration/setup, everything is consistent.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/zoph/manifest.py

@@ -16,6 +16,9 @@ backup = {
         'directories': ['/var/lib/zoph/']
     },
     'secrets': {
-        'files': ['/etc/zoph.ini'],
+        'files': [
+            '/etc/zoph.ini',
+            '/etc/dbconfig-common/zoph.conf',
+        ],
     }
 }