Make sceneModePicker more tolerant of CSS order.

NOTE: This is a pull request into `geocodingWidget` because that branch is displaying the bug.

The bug is that sceneModePicker.css is intolerant of not being "last" in the CSS inclusions.  This attempts to fix it.  This is new evidence that we should probably switch to a `shared.css` model where the share is not re-included at the top of every widget's individual CSS.  It looks like re-including a CSS you already included makes its rules gain more weight than widgets that previously included it.  So, sceneModePicker overrides some of the shared rules for its own custom buttons, but the new geocodingWidget was restoring the non-overridden versions by re-including the shared file, inadvertently affecting the sceneModePicker widget.