Fix Autofill test case failed due to ui object obscured by IME

The test android.autofillservice.cts.SimpleSaveActivityTest#testTapLink_changeOrientationThenTapBack may fail on some device due to ui object is obscured by IME.

Change wm density to 320 to pass test.

Bug: 73175031

Test: build cts test suite
Test: case android.autofillservice.cts.SimpleSaveActivityTest#testTapLink_changeOrientationThenTapBack pass on BlackBerry Key2 and Pixel XL (test result is attached on issue)

(cherry picked from commit 1e82f9b2ad83c7963cdd8944c54b9a765a0a7206)
(cherry picked from commit f1f7cd3852f8b98864b3ab45442e8db479162eab)

Change-Id: I50ec7f0f75cd6fed512230ad976ab08a7499436b
1 file changed