Increase timeout for CtsDynamicMimeHostTestCases

Increate timeout for PreferredActivitiesTest to reduce flakiness.
Add wait for BUTTON_ALWAYS click.

Bug: 159422012
Test: atest CtsDynamicMimeHostTestCases
Change-Id: I8555d15253463a6448772623b037e96a5233203e
1 file changed