Move Compact QWERTY toggle into Selection Mode screen

[Clstroud]

Lumping together a couple of related tasks into one ticket:

1. Moving the Compact QWERTY toggle from the Keyboard Layout screen to the Selection Mode screen aligns the UI with the behavior introduced in Keyboard Foundations Rewrite #791, where the QWERTY layout is the default for all orientations unless head tracking is enabled. If head tracking is enabled, the option to force the compact QWERTY layout should appear.
2. There is an issue with the Selection Mode screen's "Head Tracking" toggle/cell. When the cell is tapped to toggle head tracking, it does not update to reflect the new state. This bug is a recent regression and can be fixed while the screen receives these updates.