Add support for minibuffer-nonselected-mode in Emacs 31

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Theme(s)

All themes (base)

What package(s)/face(s) do you want support for?

from etc/NEWS:

*** New mode 'minibuffer-nonselected-mode'.
This mode, enabled by default, directs the attention to the active
minibuffer window using the 'minibuffer-nonselected' face in case
when the minibuffer window is no longer selected, but the minibuffer
is still waiting for input.

Screenshots

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