Update beds formspecs when player joins or leaves the game

[Athozus]

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Fix #3126

I wasn't able to test it but it is kind of trivial. I only called update_formspecs() when a player joins/leaves the game.

Ping @ssdaniel24

[ssdaniel24]

Didn't work for me. Try to test too, please, using multiple clients on local host.

[Athozus]

Try [...] using multiple clients on local host.

I've tried once but afaik there's no way to do it on a single PC.

[Montandalar]

Try [...] using multiple clients on local host.

I've tried once but afaik there's no way to do it on a single PC.

It's really easy to launch multiple instances of Minetest on any platform. Just run open Minetest multiple times, run the server on one of them and connect clients from the others.