Remove invalid "test" attribute. am: d78a4dc913

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/linkme-impl/+/2780512

Change-Id: Ic3fcb366a53398ca7a41e08cd83a46301fa3fbae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>