osc: usability improvements for pseudo-csd title bar

There are two improvements here:

1) Correct the right-side padding on the title box. This was messed
   up previously because I was passing the title box width when I
   should be passing the x coordinate. I've also increased the
   spacing to separate the title from the window controls more
   clearly.

2) I'ved added a mouse tracking area over the title bar so that the
   osc doesn't disappear if you hover over the title box. This didn't
   work previously because the input area only covers the actual
   window controls. The implementation here is simplified in that
   it's only a mouse area and not an input area. This is enough to
   keep the osc visible, but it won't stop the mouse pointer
   disappearing. Fixing that requires a full input area which, for
   now, I will say isn't worth the effort.

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