fix(chat) Fix iOS web chat (#11193)

Fixes: on iOS web the chat input would move from the bottom when the keyboard was open

react/features/chat/components/web/Chat.js

@@ -199,7 +199,6 @@ class Chat extends AbstractChat<Props> {
                     <ChatInput
                         onResize = { this._onChatInputResize }
                         onSend = { this._onSendMessage } />
-                    <KeyboardAvoider />
                 </div>
             </>
         );