P: Make lock and unlock icons larger and more visually distinct

The lock/unlock icons are too small and not visually distinct enough.  Using an "unlock" icon with the lock shackle facing away from the lock rather than just a small gap would improve usabliity.

Lightroom_BWeAocprvt.png

Lightroom_Nlv8L7xqyb.png

These icons are visually indistinguishable on high resolution screens.

Lightroom_ykOmCc2kXf.png

Lightroom_NHn6JyC0zA.png

Something like this would be more clear:

39063_open_256x256.png