Update Android theme to not use carets in list items
See last item here: http://developer.android.com/design/patterns/pure-android.html

> A common pattern on other platforms is the display of right-pointing carets on line items that allow the user to drill deeper into additional content.
> 
> Android does not use such indicators on drill-down line items. Avoid them to stay consistent with the platform and in order to not have the user guess as to what the meaning of those carets may be.
