Sync contacts: make the account user visible.

It doesn't really matter, because it doesn't actually do anything (although it should),
but it should be user visible.

app/src/main/res/xml/sync_contacts.xml

@@ -11,5 +11,5 @@
     android:contentAuthority="com.android.contacts"
     android:allowParallelSyncs="true"
     android:supportsUploading="true"
-    android:userVisible="false"
+    android:userVisible="true"
     android:isAlwaysSyncable="true" />