Update task bar height update logic to consider screen rotation cases

When home screen rotation is enabled, instead of updating taskbar height (assuming that folded task bar is always on the bottom of screen display), we should update taskbar width instead.

Bug: 313371759
Test: try out both folded and unfolded 3-button and gesture nav modes, enable home rotation, make sure all the nav buttons are functional and visible when they should be.
Change-Id: I16f53d9e9c3cd0229fc50b73613b032a96322b97