revert: "chore: remove obsolete workaround for broken notifications"

This reverts commit d7adaa6.

Author: jnsgruk

snap/snapcraft.yaml

@@ -61,6 +61,9 @@ apps:
       # Correct the TMPDIR path for Chromium Framework/Electron to
       # ensure libappindicator has readable resources
       TMPDIR: $XDG_RUNTIME_DIR
+      # Included temporarily until https://github.com/snapcore/snapcraft-desktop-integration/issues/28
+      # is resolved.
+      NOTIFY_IGNORE_PORTAL: 1
     plugs:
       - shmem
       - home