fix failing rust_aconfig_library test am: 521eb20dc2

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2757201

Change-Id: I0131d835b1b60b240cb276906adcd2d74a3d07fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

aconfig/rust_aconfig_library_test.go

@@ -50,11 +50,11 @@ func TestRustAconfigLibrary(t *testing.T) {
 	}
 
 	for _, variant := range variants {
-		android.AssertStringEquals(
+		android.AssertStringListContains(
 			t,
 			"dylib variant builds from generated rust code",
+			variant.Rule("rustc").Implicits.RelativeToTop().Strings(),
 			"out/soong/.intermediates/libmy_rust_aconfig_library/android_arm64_armv8-a_source/gen/src/lib.rs",
-			variant.Rule("rustc").Inputs[0].RelativeToTop().String(),
 		)
 	}
 }