Makes magnification switch UI never overlap navigationBar and statusBar

This change contrains the x,y postion of switch button to make
the button never overlap navigation bar window and status bar window.
When the orientation is changed or navigation mode is change, the
position of switch button should be ajusted by the draggable bounds
because the window insets are updated.

Bug: 185288922
Test: atest MagnificationModeSwitchTest; atest ModeSwitchesControllerTest;
Change-Id: Idc03275f39418c18a190cdff6ffb0e94280c6281