Fixed bubble bar size for the 3 buttons navigation mode.

Change logic to updated bubble properties even we do not have any
bubbles.

Fixes: 376141825
Flag: com.android.wm.shell.enable_bubble_bar
Test: Manual. Set 3 button navigation mode, rotate the device.
Change-Id: Ide6df73b3b24c628a0f9e6db6582d4e2ddadfc04