hooks: rustfmt: drop custom format suggestion am: b1f4a748ae

Original change: https://android-review.googlesource.com/c/platform/tools/repohooks/+/2621056

Change-Id: If9aebb9652fa531f05aa5a5fd753eb3c6ed7311c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>