universal-access: Reverse Repeat Keys Speed direction

Since the gsettings is for the repeat-interval but the
GUI is for Speed, we need to reverse the mapped direction.

We have to turn off the fill indicator (has_origin) for Speed
since it fills the right side instead of the left. We turn
off the indicator for Delay to match.

Closes: GNOME/gnome-control-center#311
11 jobs for reverse-key-repeat-speed in 5 minutes and 55 seconds (queued for 2 seconds)