Updates *hasNoMagnificationOverlay test to not wait for events.

If the overlay window is already added by another test case then
the first executeAndWaitForEvent would fail (as no events are sent).

Replace this with just waiting for the requested window state.

Bug: 279666704
Bug: 300929107
Test: atest AccessibilityMagnificationTest, many invocations
Change-Id: I2a183d996784fe927df6d06535e20910b0737109
(cherry picked from commit 868e2a25102b58f3425da9af9db1291a6109f08f)
Merged-In: I2a183d996784fe927df6d06535e20910b0737109
1 file changed