Touchpad Capture: Fix issues with Pointer Controller

Issues fixed:
- When "Show Touches" is enabled, enabling touchpad capture does not
hide the mouse cursor.
- When disabling touchpad capture, mouse cursor does not return to
location that it was at when touchpad capture was disabled. Instead,
it is reset to the center of the display.

Bug: 173806099
Fixes: 173806099
Test: manual
Test: atest inputflinger_tests
Change-Id: I3a0a429d6288073b7668abfbfab742f095de9c7f