CTS: Inject input events with no sync mode in AnrTests

Fixes a merge issue introduced in
Ife2057e401abf77276906f828dcdd1e6dd10002f.
Some input injection commands ended up being sync. This meant
input would block waiting for the unresponsive process.

Also removes some unnecessary sleeps in the tests.

Test: atest android.server.wm.AnrTests --rerun-until-failure
Fixes: 203165273

Change-Id: I9b87a0b9e70a986948092100696dece61aa12d59
Merged-In: I9b87a0b9e70a986948092100696dece61aa12d59
7 files changed