region: Fix input source options not being applied.
requested to merge robert.ancell/gnome-control-center:region-input-settings-no-delay-3-32 into gnome-3-32
This was broken in a86cf1ec (3.32) when the input options dialog was converted into a GtkPopover. Previously two GSettings objects were used, with one set to 'delay-apply' mode. The input source option didn't apply the changes.
The 'delay-apply' mode is from the original commit d3852fc8, however code was simplified in b3199dd6 to only set one setting. This meant that the delay is no longer necessary.
Fixes #440 (closed)