Don't reset installer to session when installer been set to shizuku previously, but shizuku isn't running at the time droid-ify is launched

[soredake]

Is your feature request related to a problem? Please describe.
Right now, after reboot, droid-ify will launch before you can start shizuku, meaning droid-ify will think that shizuku is not present and will switch installer to session, requiring you to change the installer setting after each reboot.

Describe the solution you'd like
Don't reset installer to session when installer been set to shizuku previously, but shizuku isn't running at the time droid-ify is launched

Describe alternatives you've considered
Doing installer change manually, which I want to avoid.

Additional context
#735
#601

[Uneccessary]

I would recommend setting the the Installer temporary when an installation is beeing tried and Shizuku is not active, and revert it back to Shizuku installer when it's beeing detected as active.