Refactor TransitionSelectionTests of freeform activities

Currently, there are three failing tests are testing unresizable
freeform activities. However unresizable freeform activities are
launched as fullscreen, which is a spec. The intents of the tests are to
test transition selection of freeform activities which do not occuppy
the whole screen, which need to be freeform resizable activities. Thus,
adjust test variables to launch activities in freeform to meet the
assumption.

Bug: 201322334
Test: atest TransitionSelectionTests
Change-Id: I39c6f118a813ea490d5d99e23c3355c5ad584a37
1 file changed