[BUG] Draft message is shared between different Threads

[IlarionHalushka]

Steps to reproduce:

• open Threads List Screen
• open Single Thread Screen
• type message '123' but don't send it
• go back to Threads List Screen
• open other Thread

Expected: draft message is not in input.
Actual: draft message is shared between Single Threads Screen.

• Your Rocket.Chat Experimental app version: 1.12.0.6971
• Your Rocket.Chat server version: open.rocket.chat
• Device (or Simulator) you're running with: Iphone SE