Missing `players.clear()` inside the `remove_multiplayer_peer` of the example lobby implementation

[Gr0minet]

Your Godot version: v4.3.stable.official.77dcf97d8

Issue description: In the example lobby implementation, a call to players.clear() is missing inside the remove_multiplayer_peer function. Otherwise the players dictionary is not reinitialized when a player disconnects and reconnects. The dictionary will contain among others his own previous multiplayer id which should have been erased because he disconnected, or multiplayer ids of players who disconnected when the player was disconnected himself.

URL to the documentation page: https://docs.godotengine.org/en/stable/tutorials/networking/high_level_multiplayer.html#example-lobby-implementation