Disable message box for groups with restricted access

In a group where administrators have restricted members from writing, the message box is enabled. Only after trying to send a message the user is informed that the access is denied.

Steps to reproduce:

1. Join a group where administrators have restricted members from writing
2. Write any message and hit send

Result:

A modal with the following message pops up:

Access denied
You are not allowed for this action.
Technical details: Method: messages.sendMessage
Result: {"_":"rpc_error","error_code":403,"error_message":"CHAT_WRITE_FORBIDDEN"}