Build blobstore test app against "test_current" sdk.

Bug: 151035961
Test: atest --test-mapping cts/hostsidetests/blobstore
Change-Id: Ia742a6e492d8038cab00530902c28f996da02885
diff --git a/hostsidetests/blobstore/Android.bp b/hostsidetests/blobstore/Android.bp
index aab448e..2baec7f 100644
--- a/hostsidetests/blobstore/Android.bp
+++ b/hostsidetests/blobstore/Android.bp
@@ -42,7 +42,7 @@
       "testng",
   ],
   manifest : "test-apps/BlobStoreHostTestHelper/AndroidManifest.xml",
-  platform_apis: true,
+  sdk_version: "test_current",
   // Tag this module as a cts test artifact
   test_suites: [
     "cts",