Fix SensorRect location

The window includes the additional padding, but SensorRect was
still positioned flush to the top+left. This CL 1) Translates the
SensorRect and positions it correctly within the window, and
2) Removes translation from enrollment animation, since it's already
taken care of by SensorRect's fixed positioning

Without this change, the enrollment animations are in the right
place, but the HBM dot was wrong (only slightly, due to the small
padding so far). However, with larger padding, the dot would be
really off.

Bug: 179083247
Test: manual
Change-Id: I556f5bebe5177a748f19cadeab86d1d962d3e1f1