Tag "tests" alone doesn't prevent including emma.jar

Only if an app has LOCAL_INSTRUMENTATION_FOR, it can get the emma
classes from the target app and we don't need to instrument the test app
itself.

Change-Id: If0fba50ddae757254fc58ca104d729d61603fd78
diff --git a/core/package_internal.mk b/core/package_internal.mk
index a2cbe31..cb77e76 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -176,7 +176,7 @@
 ifeq (true,$(EMMA_INSTRUMENT))
 ifndef LOCAL_EMMA_INSTRUMENT
 # No emma for test apks.
-ifeq (,$(filer tests,$(LOCAL_MODULE_TAGS))$(LOCAL_INSTRUMENTATION_FOR))
+ifeq (,$(LOCAL_INSTRUMENTATION_FOR))
 LOCAL_EMMA_INSTRUMENT := true
 endif # No test apk
 endif # LOCAL_EMMA_INSTRUMENT is not set