Fix fingerprint dialog icon color

The Keyguard resource has 50% opacity on the "ridges" assets but 100% on
the "error" assets, making it very difficult to fix/animate correctly in
both Keyguard and FingerprintDialogView. This change decouples the
FingerprintDialogView from the Keyguard resource.

Fixes: 75290621

Test: manual test with FingerprintDialog APK
      visually inspect colors/animations

Change-Id: Ie04c706e24e129f01b6ddb500c689f108c41ae3e