fix private public chat lock interference

bigbluebutton-html5/imports/ui/components/chat/container.jsx

@@ -229,7 +229,8 @@ const ChatContainer = (props) => {
 
 export default lockContextContainer(injectIntl(withTracker(({ intl, userLocks }) => {
   const chatID = Session.get('idChatOpen');
-  const isChatLocked = userLocks.userPrivateChat || userLocks.userPublicChat;
+  const isChatLocked = (userLocks.userPrivateChat && chatID !== PUBLIC_CHAT_KEY)
+      || (userLocks.userPublicChat && chatID === PUBLIC_CHAT_KEY);
 
   if (!chatID) {
     // No chatID is set so the panel is closed, about to close, or wasn't opened correctly