[kbd] plain keycode changes not only the first column

[Oleg Bulatov]

Hi,

when a key is defined with exactly one action code, and `plain keycode NNN = ACTION` is used after that, it acts as if the `plain` modifier is not present. It changes the key definitions for all modifiers.

Steps to reproduce:

$ cat example.map
keymaps 0-1
keycode 46 = x
plain keycode 46 = +c
$ loadkeys ./example.map
$ dumpkeys -f | grep ' 46’

Expected output:

keycode  46 = +c               +X

Actual output:

keycode  46 = +c               +C

--
WBR, Oleg
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