Add text direction locale to BGR img layout notifs

Render OneSignal's custom background image notfications in
RTL (right-to-left) for those devices that have set a language
that renders in this direction.

This does not account for some spacing issues however the next commit
will cover this.

Author: jkasten2

OneSignalSDK/onesignal/src/main/res/layout/onesignal_bgimage_notif_layout.xml

@@ -30,13 +30,12 @@
     </RelativeLayout>
 
     <LinearLayout
-        xmlns:tools="http://schemas.android.com/tools"
-        tools:ignore="RtlCompat"
-
         android:orientation="vertical"
         android:layout_marginStart="@android:dimen/notification_large_icon_width"
         android:layout_width="fill_parent"
-        android:layout_height="64dp">
+        android:layout_height="64dp"
+        android:textDirection="locale"
+        >
         <TextView
             android:id="@+id/os_bgimage_notif_title"
             android:layout_width="match_parent"