Remove waits for toasts from StreamedAppClipboardTest

The waits were originally introduced because of b/265325338.
Without waits the tests are significantly faster and less flaky.

Bug: 288339992
Test: atest StreamedAppClipboardTest --iterations 100
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:b75f8614382d22741e737f0a29acf1964e520c11)
Merged-In: Id58574ba138c54048b4c3be745657b982bd92c36
Change-Id: Id58574ba138c54048b4c3be745657b982bd92c36
1 file changed