bug#23559: 25.0.93; Wrong type argument on C-u C-x = with Czech input method

[Milan Zamazal]

>>>>> "EZ" == Eli Zaretskii <eliz@gnu.org> writes:

    EZ> Do you (or someone else) understand why Czech and Slovak input
    EZ> methods include kp-* keys in the input method definitions?

The reason is that those input methods replace digit keys at the main
part of the keyboard with Czech and Slovak characters.  But the keys at
the numeric keypad should of course still produce digits and not Czech
and Slovak characters.

IIRC at the time those input methods were introduced, quail definitions
like

  ("1" ?+)

caused both the `1' and kp-1 keys to produce `+' and adding

  ([kp-1] ?1)

was necessary to keep kp-1 producing `1' and not `+'.  If this is no
longer necessary then those bindings can be simply removed.