Fix irc-addressed false positives

Commit 3e585499 replaced a `subst-mutate` with a `.= subst` as a
result of a v6.d deprecation. The surrounding code relied on the
return value being falsy when no substitution took place. This was
true for `subst-mutate` but isn't for `subst` which always returns
the resulting string. In this case, this caused every PRIVMSG to
fire an `irc-addressed` event.

This is fixed by using s///, which mutates but returns the Match
(or Nil).

0 files changed, 0 insertions, 0 deletions