Drafts of messages are not saved in chats with topics

[Mideks]

In regular and group chats, when you write a message, but do not finish it and exit the chat, it remains as a draft, and the next time you enter the chat it will be in the message input field.
However, in chats with topics enabled, drafts of messages are not saved. When you exit, the message is simply lost.

[FrayxRulez]

Added to #2953