Fix TEST_MAPPING after removing tests. am: 4e50c134d4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/shared_child/+/2748035

Change-Id: I2b5375af75e076442537b6f85ad64d4a3e456276
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>