Preserve window while triggered relaunches

Activities are relaunched while updating the debug view attribute
state. That makes the toggle transition different from others. This
CL keeps the preserveWindows when relaunched activities to prevent
the black screen within a short time.

Bug: 248454366
Test: atest ActivityThreadTest
Change-Id: I68ec07916b582c15d39f226c8ad80a62262867b7