Disable the new run test modules when not building ART from sources.

Test: m droid SOONG_CONFIG_art_module_source_build=false
  in a platform tree
Test: art/build/build-art-module.sh
  on master-art
Test: lunch armv8-eng && art/tools/buildbot-build.sh
  on master-art
Bug: 172480615
Change-Id: Ic342e427d4911e2afce7d5bdf032cc9fdb5a3eb0
diff --git a/test/Android.run-test.bp.py b/test/Android.run-test.bp.py
index 1aa57df..a051a1d 100755
--- a/test/Android.run-test.bp.py
+++ b/test/Android.run-test.bp.py
@@ -47,6 +47,7 @@
       f.write(textwrap.dedent("""
         java_genrule {{
             name: "art-run-test-{mode}-data-merged",
+            defaults: ["art-run-test-data-defaults"],
             out: ["art-run-test-{mode}-data-merged.zip"],
             srcs: [
                 {srcs}