Every %K (dark grey / bright-black) swapped for %X17 — 256-colour
foreground 0x17 == palette index 23, RGB #005f5f, a very dark
teal/cyan. Applies to: body text, bracket/punctuation replaces,
message-body dim, connective text in join/part/quit/etc. formats,
dccfile name, whois values, servernotice body, wallop body.
Requires a 256-colour-capable terminal; irssi renders %X17 as
palette 23 when the terminal advertises 256 colour support (most
modern terminals do — .tmux.conf already sets TERM=screen-256color).
dissimulo
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