sdl_event_forwarder always closing after short inactivity

[gu50]

Key forwarding (used for rp2040-doom) seems to work fine for as long as there's a continous stream of keypresses to send. After a short inactivity, my client always closes.

Poking it with the big stick my almost non-existent programming abilities are, I found the SDL_WaitEvent() becoming false after a short inactivity - so I removed it from the while-loop's condition's AND and put it into the loop:

`old: //while (!done && SDL_WaitEvent(&event)) {

new: while (!done) {
SDL_WaitEvent_return = SDL_WaitEvent(&event);`

At least, this way it now seems to keep working and doesn't close after short inactivity.

There might, of course, be much better (or more correct) ways to solve this issue than this amateurish hack (and maybe it's even caused by something completely unrelated) - but at least it did fix my issue with it :)

This just in case anyone else is seeing a similar issue (or has a better way of fixing this).