gtksocket: Adjust X sizes by scale-factor

X uses unscaled sizes, so they must be scaled properly. Otherwise
GtkSockets end up twice as big as they should be.

Closes: https://bugzilla.gnome.org/show_bug.cgi?id=765327
Signed-off-by: Jason Zaman <jason@perfinion.com>
1 job for gtksocket-scale-3-22 in 35 minutes and 33 seconds (queued for 36 seconds)
Status Job ID Name Coverage
  Build
passed #36680
build

00:35:33