region: Fix input source options not being applied.
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
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