Merge cleanup: toggle correct parent bg for FSO views
Now, we're changing the button's parent's parent, instead of just its parent.  In reality this is a stop-gap fix until we can really address the problems with the "non-detail" view modes.  Part of that fix will require explicit targeting of the proper parent view of each fso selection toggle button.  We shouldn't be making parent-related assumptions about the view heirarchy of the listview/gridview items.
Merge cleanup: enforce "Show thumbnails" default value
Turns out that defaults are defined in FileManagerSettings and not in XML