Don't use UiDevice#click

UiDevice#click doesn't work in multi windowing mode.
This fixes the issue by avoiding using the method.

The uiautomator bug is tracked separately.

Bug: 237950127
Test: atest android.autofillservice.cts.dialog.LoginActivityTest \
  android.autofillservice.cts.dropdown.LoginActivityTest \
  android.autofillservice.cts.saveui.PreSimpleSaveActivityTest \
  android.autofillservice.cts.saveui.SimpleSaveActivityTest
Change-Id: I0312df01c132b9ba623e1c53305489cc586ec7e5
2 files changed