Keep keyboard visible when buttons are pressed.

This fixes momentary clicks which hide the keyboard, causing the button press never to be released.

It's still possible to get keys stuck by drag-and-dropping away from the original key.

Addresses the root cause of #18
1 job for fix_keyboard_away in 55 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
passed build-native #5270
librem5

00:00:55