Ravenwood: sdk to test_current

This also the dependency to be test_current too and use test only api

Bug: 311772251
Test: m flag-util
Flag: TEST_ONLY
Change-Id: Icf2c4b4a328ac97eb0707c39f305580e8e9de4a5
diff --git a/ravenwood/Android.bp b/ravenwood/Android.bp
index 178102e..23f058d 100644
--- a/ravenwood/Android.bp
+++ b/ravenwood/Android.bp
@@ -93,7 +93,7 @@
     srcs: [
         "junit-flag-src/**/*.java",
     ],
-    sdk_version: "module_current",
+    sdk_version: "test_current",
     libs: [
         "junit",
         "flag-junit",