Do not use a user tag on apps, as it is ignored.

The build system does not honor user tags on apps,
and setting it is misleading.

This removes the confusion by making the makefiles
behave like they read.

Change-Id: Idb2afba98635dd41092cad0eb7432516b048bf67
diff --git a/pico/Android.mk b/pico/Android.mk
index 1dd1b60..4ce7d7f 100755
--- a/pico/Android.mk
+++ b/pico/Android.mk
@@ -10,7 +10,7 @@
 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
-LOCAL_MODULE_TAGS := user
+LOCAL_MODULE_TAGS := optional
 
 LOCAL_SRC_FILES := $(call all-subdir-java-files)