!watch pings in channel where user is seen, not channel where watch is set

[WaveHack]

Originally reported by: xeross (Bitbucket: xeross, GitHub: xeross)

---

The !watch command will trigger in the channel where a user is seen and not in the channel where the watch was set (Or however else it should work).

So sometimes you get a user being pinged in a channel they aren't even in.

---

• Bitbucket: https://bitbucket.org/WaveHack/pinkiebot/issue/15