fix(models: channelconfig): fix ChannelConfig#setChannel setting map …

…w/ undefined property

This fixes double posting when initializing & removing repos, and changing config.

lib/Models/ChannelConfig.js

@@ -222,7 +222,7 @@ class ChannelConfig {
         new: true,
       }, (err) => {
         if (err) return reject(err);
-        this._data.set(newConfig.channel, new ChannelConfigItem(this, newConfig));
+        this._data.set(channel, new ChannelConfigItem(this, newConfig));
         resolve(this);
       });
     });