The code changed here wants to distinguish the cases of whether `arg` is a list
with one set of args to `spacemacs|diminish` or a list of a list of such args.
It used to look at the second element of `args` to make that distinction.
Consequently, if you want to specify a list of a list of args for
`:spacediminish`, you'd have to have at least two such lists of args in the list.
However in
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