layout: Focus prev column when removing just created column

This works similar to tabs in Firefox: when you create a tab and then
close it without focusing any other tabs, the focus returns to the
previously-focused tab, rather than the usual next tab. The logic is
that in this case, the new tab was likely transient, and the user wants
to get right back to what they were doing.

In niri's case, this also serves as a workaround for wl-clipboard
spawning and destroying a window, messing up the focus.

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