Rework test for Notification Template

It doesn't make a lot of sense to check for intrinsic width of a
drawable - we really care about proper aspect ratio and crop style of
the image views in templates. So verify the ratio and scaleType instead,
avoiding having to deal with DPI issues.

Bug: 260805673
Test: atest on Pixel 6, 7 (default and 240dpi configuration), atest on Android Go device and ABTD test runs on Android TV device.
Change-Id: I87e8a36e0f84a43d71926b9c21f1434c85dbea9e
2 files changed