Use correct system_modules with core.current.stubs

The system_modules defn used with core.current.stubs
was core-system-modules which doesn't match. Instead,
this change uses core-current-stubs-system-modules.

Test: build
Change-Id: Ifb9e77b02bbb04c1cb39c6b9f97932c20d44d8ba
diff --git a/java/testing.go b/java/testing.go
index fc7842d..e1b06a0 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -108,6 +108,7 @@
 
 	systemModules := []string{
 		"core-system-modules",
+		"core-current-stubs-system-modules",
 		"core-platform-api-stubs-system-modules",
 		"android_stubs_current_system_modules",
 		"android_system_stubs_current_system_modules",