Players can be kicked for spamming in a singleplayer world with cheats disabled

In a single player world with cheats disabled, sending lots of messages in the chat repeatedly causes the player to be kicked from the world for spamming.

Steps to Reproduce:

1. Create or join a world with cheats disabled
2. Spam messages in chat (sleeping in a bed can make this easier)

Expected & Observed Results:

- Player is kicked from the world.
- The player would not be kicked, as it's a singleplayer world, and the only player that can see the messages is the one who sent them.

Screenshots/Videos:

MC-14923.mp4

Notes:

When kicked, the player is sent to the multiplayer screen. (Tracked in MC-45602)