Blender Git Loki

Fix: UI layout for "Pause" button on timeline header was broken (leaving a gap)

A recent change in the UI layout code probably broke how the scale_x
for layouts was getting handled. This was leaving a large gap
(and causing layouts to pop) when trying to scrub the timeline.

This commit fixes this with a manually-found value that largely seems
to get rid of the popping problem. There's still a little jumping (1-2 px)
but it's less distracting now.