Skip self in nick completion

src/groupchat_control.py

@@ -1520,6 +1520,7 @@ class GroupchatControl(ChatControlBase):
 				self.nick_hits = [] # clear the hit list
 				list_nick = gajim.contacts.get_nick_list(self.account,
 									self.room_jid)
+				list_nick.remove(self.nick) # Skip self
 				for nick in list_nick:
 					if nick.lower().startswith(begin.lower()):
 						# the word is the begining of a nick