postmarketos-fde-unlocker: make unl0kr the default

I'll need some more time to test this. Have been fighting severe network issues this evening so this is just a blind patch so far.

Fixes: #1411 (closed)

TODO:

• cherrypicker/unl0kr#34 (closed)
• cherrypicker/unl0kr#36 (moved) (at least good enough)
• new unl0kr version in pmaports with fixes for the above issues
• !3777 (merged)