Fix TiviTest with --new-gradle

Change-Id: I716531c8f9661e8fb3d0f3a2cfccec392830185d
diff --git a/src/test/java/com/android/tools/r8/internal/opensourceapps/TiviTest.java b/src/test/java/com/android/tools/r8/internal/opensourceapps/TiviTest.java
index e220e0a..05d0d8b 100644
--- a/src/test/java/com/android/tools/r8/internal/opensourceapps/TiviTest.java
+++ b/src/test/java/com/android/tools/r8/internal/opensourceapps/TiviTest.java
@@ -42,7 +42,8 @@
   public static void setup() throws IOException {
     assumeTrue(ToolHelper.isLocalDevelopment());
     outDirectory = getStaticTemp().newFolder().toPath();
-    ZipUtils.unzip(Paths.get("third_party/opensource-apps/tivi/dump_app.zip"), outDirectory);
+    ZipUtils.unzip(
+        Paths.get(ToolHelper.THIRD_PARTY_DIR, "opensource-apps/tivi/dump_app.zip"), outDirectory);
   }
 
   @Test