Clean up rust_test_host TEST_MAPPING after default update
After b/177689340, rust_test_host doesn't need TEST_MAPPING config anymore to run in presubmit. Change-Id: I0cb8366f29372855a61809e754d30a9eea433839 Test: presubmit Bug: 178646865
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After b/177689340, rust_test_host doesn't need TEST_MAPPING config anymore to run in presubmit. Change-Id: I0cb8366f29372855a61809e754d30a9eea433839 Test: presubmit Bug: 178646865
mentioned in commit 382fd0e8
mentioned in commit 1e637777
mentioned in commit 5ac52695
mentioned in commit 961f7baf
mentioned in commit 961f7baf
mentioned in commit ffb16557