Fix app FTL runs.

Author: vkryachko

buildSrc/src/main/groovy/com/google/firebase/gradle/plugins/ci/device/FirebaseTestServer.java

@@ -46,7 +46,7 @@ public void uploadApks(String variantName, File testApk, File testedApk) {
     // test lab requires an "app" apk, so we give an empty apk to it.
     String testedApkPath =
         testedApk != null
-            ? testApk.toString()
+            ? testedApk.toString()
             : project.getRootDir() + "/buildSrc/resources/dummy.apk";
     project
         .getLogger()