Fixed a bug whereby chatstates were disable incorrectly with the following scenario:

client #1: send client #2 a message (state is ask)
client #2: recv's message and set's chatstate active since the message used JEP 85
client #1: sends another message, but since client #2 has not responded yet it sends not chatstate
client #2: recv's message and set's chatstate to False because JEP 85 was not used
(Note, if client #2 would have responded after the first message chatstates would be in effect.

src/gajim.py

@@ -386,7 +386,7 @@ class Interface:
 					contact.chatstate = 'active' # no more
 				
 				chat_win.handle_incoming_chatstate(account, jid, chatstate)
-			else:
+			elif contact.chatstate != 'active':
 				# got no valid jep85 answer, peer does not support it
 				contact.chatstate = False
 		else: