Fix up wrap around icon

[benogle]

This is an extension on #572. There were a couple issues:

• The icon was only shown when the find view was open
• The icon could not be centered vertically over the editor in CSS because it was a child of the find view
• The icon was centered horizontally over the fnr panel, not the editor, so it didnt make sense with splits
• The colors didnt work well with some theme combinations

Looks like this now:

cc @mrodalgaard

[benogle]

Travis is soooo sloooow.