Fix fingerprint on lockscreen preivew

1. Fingerprint's color should be text primary
2. Fingerprint should be solid lines
3. Fingerprint should be 50% of the width and height

Test: Tested the fingerprint on the lockscreen preview shows correctly. See bug.
Bug: 280334700
Change-Id: I8b92316bcfe30ae9724259ba8abfe6af4c2c5463