fix(List apps installed): add missing call to 'cursor.close()' when fetching installed PWA

Description

In logcat I saw each time " A resource failed to call close" for a while. This MR fix it.

Technical details

When listing installed PWA to sync list of installed apps, the query's cursor wasn't closed if no PWA was installed. This is fixed.

Tests

• Checked with Strictmode enabled

Issues

https://gitlab.e.foundation/e/os/backlog/-/issues/1843

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