Invoke '--remove-buffers before listing buffers

"nil" has been showing up recently when I hit <C-x b>, presumably
because 'buffer-name for a dead buffer returns 'nil. No big deal, we'll
just call exwm-buffer-groups--remove-buffers before giving a list of
buffers in the completing read. This *might* not be the most elegant
solution, in which case I'll hopefully come up with something better
later on.

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