Remove check for UnusedResources in webkit testapp
Remove check for UnusedResources in webkit testapp

This appears to be a flaky lint check, and although
it would be nice to know the cause and what triggers it
for now we can just disable this check here since the check
is irrelevant in a testapp.

Test: N/A
Change-Id: I739f3f01eb16373e6d3891aa2c719986a6c78ccc

androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx