Closes#32538
This PR adjusts the defaults for splitting panes along the horizontal
and vertical actions. Based upon user feedback, the adjusted values seem
more reasonable as default settings, hence, go with these instead.
Release Notes:
- Changed the default split directions for the `pane: split horizontal`
and `pane: split vertical` actions. You can restore the old behavior by
modifying the `pane_split_direction_horizontal` and
`pane_split_direction_vertical` values in your settings.
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