shaarli: Utilize purging of packages and don't remove explicitly

Tests:

- Uninstall shaarli and notice that /var/lib/shaarli directory has been removed.

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

plinth/modules/shaarli/__init__.py

@@ -12,7 +12,7 @@ from plinth.modules.backups.components import BackupRestore
 from plinth.modules.firewall.components import Firewall
 from plinth.package import Packages
 
-from . import manifest, privileged
+from . import manifest
 
 _description = [
     _('Shaarli allows you to save and share bookmarks.'),
@@ -69,8 +69,3 @@ class ShaarliApp(app_module.App):
         """Install and configure the app."""
         super().setup(old_version)
         self.enable()
-
-    def uninstall(self):
-        """De-configure and uninstall the app."""
-        super().uninstall()
-        privileged.uninstall()

plinth/modules/shaarli/privileged.py

@@ -1,12 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""Configure Shaarli."""
-
-import shutil
-
-from plinth.actions import privileged
-
-
-@privileged
-def uninstall():
-    """Remove Shaarli's data directory."""
-    shutil.rmtree('/var/lib/shaarli/data', ignore_errors=True)