Replace `keyboard --mod3/--ion` with `--winkey`
Replace `keyboard --mod3/--ion` with `--winkey`

Intent is clearer: Windows key is set to either `mod3` or `mod4`, and
the other is unset.

    ## old
    $ keyboard --mod3
    ## new
    $ keyboard --winkey=mod3

    ## old
    $ keyboard --ion
    ## new - do something different if I ever switch back to `ion3` WM

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