zoph: Don't fail while uninstalling

Fixes: https://discuss.freedombox.org/t/solved-zoph-uninstall-failure/3431

There is a debconf question being asked about remove the uploaded files while
uninstalling the package. If it is not answered, removal fails. So, answer the
question during installation.

Re-run setup so that answer is set.

Tests:

- In Bookworm and Trixie, install the app, upload an image and uninstall it.
Uninstall is successful and directory /var/lib/zoph does not exist.

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

plinth/modules/zoph/__init__.py

@@ -44,7 +44,7 @@ class ZophApp(app_module.App):
 
     app_id = 'zoph'
 
-    _version = 2
+    _version = 3
 
     configure_when_disabled = False
 

plinth/modules/zoph/privileged.py

@@ -23,6 +23,7 @@ def pre_install():
         'zoph zoph/dbconfig-upgrade boolean true',
         'zoph zoph/dbconfig-remove boolean true',
         'zoph zoph/mysql/admin-user string root',
+        'zoph zoph/rm_images select yes',
     ])