Issue 4945: Re-Fix PWA status

Description

After some changes, the PWA installation status was broken again.
This merge request aims to fix them again.

Issue(s)

https://gitlab.e.foundation/e/backlog/-/issues/4945

Test environment

Gradle build from branch 4945-2_re-fix_pwa_status, install the apk and test.

Test procedures

Technical details

We were checking app install status for native apps only, considering PWAs as native apps as well. This is incorrect. Appropriate documentation has been added in the code.

Screenshots

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation