Fix channel selection logic

Currently the bot won't send anything if it's not in ANY of the
channels the message is meant to go to.

Fix by intersecting message destination channels with channels the bot
is in and sending the message to those.

Author: zoffixznet

lib/Geth/Plugin/GitHub.pm6

@@ -43,9 +43,9 @@ method irc-started {
 
             dd [ 'chans', @chans, @bot-chans, @chans ⊆ @bot-chans ];
 
-            if @chans ⊆ @bot-chans {
+            if keys @chans ∩ @bot-chans -> @send-to-chans {
                 my $text = make-text $e;
-                for @chans -> $where {
+                for @send-to-chans -> $where {
                     for $text.lines -> $text {
                         throttle { $.irc.send: :$where, :$text }
                     }