Fixed testapp module tag to match CtsUiAutomatorTest.

Change-Id: I0284b5cf8093f392afded335f20648dba3ff2aa6
diff --git a/tests/CtsUiAutomatorTest/testapp/Android.mk b/tests/CtsUiAutomatorTest/testapp/Android.mk
index ef5801e..6df6028 100644
--- a/tests/CtsUiAutomatorTest/testapp/Android.mk
+++ b/tests/CtsUiAutomatorTest/testapp/Android.mk
@@ -16,7 +16,7 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_TAGS := tests
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_APPS)
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)