Force calculator to launch in fullscreen for quickswitch tests

Follow on to ag/27050655 to fix last flaking test suite, while investigating proper fix

Bug: 333446588
Bug: 333446588
Flag: None
Test: atest NexusLauncherTests:com.android.quickstep.TaplTestsKeyboardQuickSwitch
Test: forrest build with CL (https://android-build.corp.google.com/builds/abtd/run/L47500030003265061)
Change-Id: I28df139779af49b7bc8da567cfe67e5d43b224e9