update info stored on server when we move a contact from edit group window

src/dialogs.py

@@ -71,6 +71,8 @@ class EditGroupsDialog:
 	def update_contact(self):
 		self.plugin.roster.remove_contact(self.user, self.account)
 		self.plugin.roster.add_contact_to_roster(self.user.jid, self.account)
+		gajim.connections[self.account].update_contact(self.user.jid,
+			self.user.name, self.user.groups)
 
 	def on_add_button_clicked(self, widget):
 		group = self.xml.get_widget('group_entry').get_text()