Reuse the requested launch task even if no activities

Activity was requested to be launched in an empty task which
was restored from recent tasks, but the activity was end up
landed on another newly created task and caused the empty task
leaked.

Bug: 143917883
Test: atest MultiDisplayActivityLaunchTests
Change-Id: Iddc75e5893b44fc9941e17bb70cb89204e13577d
1 file changed