Remove screenshot assertion from LoginActivityTest#testDatasetPickerPosition

Screenshot assertion is flaky easily, dialog or notification showing
while taking screenshot may cause test fail. This test already assert
the username and password view's position and picker's content and
position, it's ok to remove the screenshot assertion.

Bug: 155039107
Test: atest android.autofillservice.cts.LoginActivityTest#\
testDatasetPickerPosition

Change-Id: I33c5d70dd520857486690bdea367a5804441c7ac
1 file changed