Remove test case for stoppd user.

If the user is stopped, there's no way we can create a session in it
without using INTERACT_ACROSS_USERS. AppSearch doesn't support
cross-user requests anymore, so this will get a different
SecurityException back than what we're expecting.

Bug: 193903221
Test:  atest -m -c --rebuild-module-info
CtsAppSearchHostTestCases
Test: presubmit

Change-Id: I884127003b5327b5b7f957f0f89ef88166da653d