Don't recreate taskbar on rotation

This was a regression due to ag/17241303, since technically the size changes when rotating (width and height swap). Now we detect that case and don't recreate, but instead propagate the new DeviceProfile via TaskbarActivityContext#updateDeviceProfile()

Test: Open an app, rotate device, ensure taskbar isn't recreated. Changing properties such as dark theme does still recreate taskbar.
Bug: 219981733
Change-Id: Ic827c8e697a284a085609ea8653d77900686306a