Handle uninstall action for active device admin app

• Device OS and version: Oreo
• F-Droid version (in the About screen): 1.4

What did you do? (clear steps if possible)

• install WaveUp
• enable it
• enable Lock screen in app
• go back to F-Droid
• press Uninstall

What did you expect to see?

It should pop-up a dialogue telling the user this app has Device Admin permissions and offering a button to that specific entry in Android Settings to first remove Admin rights

What did you see instead?

Unknown error dialogue

Logcat says: PackageManager: Not removing package com.jarsilio.android.waveup: has active device admin

BTW, trying to uninstall from the launcher, PackageInstaller pops a notification that links to DeviceAdmin as expected.