Fix bidi direction of dialog and bidi-wrap service name

Previously, the name of the service being in a different direction
from the locale could cause bidi artifacts.

Now, we explicitly set the direction of the dialog to the locale, and
bidi-wrap the service name.

Test: Manual
Change-Id: I563299866b24a4ce90fa2d09781aa269d8de2edd
Fixes: 37761152

res/layout/enable_accessibility_service_dialog_content.xml

@@ -18,6 +18,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
+    android:textDirection="locale"
     android:scrollbarStyle="outsideOverlay"
     android:gravity="top">