MessageComposerView sends typing events on view restoration

[bychkovdmitry]

When navigating back to a screen with MessageComposerView it automatically sends typing events even if the composer is empty.

To Reproduce Steps to reproduce the behavior:

1. User 1: Open a channel
2. User 2: Open the same channel
3. User 2: Navigate to the channel details screen
4. User 2: Navigate back to the channel

Expected behavior User 1: Nothing happens

Actual behavior User 1: Sees that User 2 started typing