UI Nits: OCD cosmetics for splitter handles

OK, I admit it, I am OCD when it comes to this stuff. The
handles are a WIP and Damien is working hard on it, but for
now I just wanted to get rid of;

- spacing between handle and content
- focus / height of handle toolbar

Its gonna go when Damien finishes his excellent work, but I
just needed to get rid of it temporarily, I was getting bit
of a twitch ;)