Fix TextViewIntegrationTest

The test is still flaky on the cuttflefish emulator.

The click action is performed before the activity is rendered on the
screen. I am not aware of a callback to get a notification of the
completion of the rendering, and so I added a 2s wait. I have tried to
call moveToSatate(RESUMED), but it doesn't help.

Test: Launch the cuttlefish emulator. Run the test for 100 times.

Fixes: 172494606
Change-Id: I90d25e14683d9c2a90885c76ad17e9a9cfb58988