ttrss: Fix issue with installing after an uninstalling

Tests:

- Without the patch, uninstall and reinstall will fail. With patch it passes.

- Rerunning setup does not destroy the contents of the database.

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

plinth/modules/ttrss/__init__.py

@@ -38,7 +38,7 @@ class TTRSSApp(app_module.App):
 
     app_id = 'ttrss'
 
-    _version = 6
+    _version = 7
 
     def __init__(self) -> None:
         """Create components for the app."""

plinth/modules/ttrss/privileged.py

@@ -77,6 +77,12 @@ def setup():
 
     aug.save()
 
+    config = _get_database_config()
+    # dbconfig may not always setup the database and user account correctly.
+    # Following, operation to create database/user is an idempotent operation.
+    postgres.create_database(config['database'], config['user'],
+                             config['password'])
+
     if action_utils.service_is_enabled('tt-rss'):
         action_utils.service_restart('tt-rss')