[automerger skipped] Fix blank pink loading icons by ensuring that cache entry won't downgrade existing icon. am: 0e4ebc9ff2 -s ours

am skip reason: Merged-In I8aac643ec5ca3162cd62bf1051cc751800c626dd with SHA-1 d073ab0b39 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/27303311

Change-Id: I8e5a45ccc7436c5fdf9ae8cd351827b81f57c760
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>