Fix test to use --experimental_platform_in_output_dir.

Bug: 197925723
Test: CI
Change-Id: I89dfb38efe261f008e7aab8d76eb3ff5c18add69
diff --git a/tests/bp2build_bazel_test.sh b/tests/bp2build_bazel_test.sh
index 01b4760..4f37c2b 100755
--- a/tests/bp2build_bazel_test.sh
+++ b/tests/bp2build_bazel_test.sh
@@ -105,7 +105,7 @@
   # NOTE: We don't actually use the extra BUILD file for anything here
   run_bazel build --package_path=out/soong/workspace //foo/...
 
-  local the_answer_file="bazel-out/k8-fastbuild/bin/foo/convertible_soong_module/the_answer.txt"
+  local the_answer_file="bazel-out/android_target-fastbuild/bin/foo/convertible_soong_module/the_answer.txt"
   if [[ ! -f "${the_answer_file}" ]]; then
     fail "Expected '${the_answer_file}' to be generated, but was missing"
   fi