Update Discord voice timeout

[ilijaivanov]

From my own testing, I've come to the conclusion that the default timeout is too short - the bot would stop playing music if the voice connection got lost for a moment or if it was moved to another channel. I think 5 seconds is plenty of time for it to reconnect to voice if it disconnects.

It could probably be even shorter, but as far as I'm aware, there's no downside to it being a higher value, besides the bot realizing it lost connection to the voice channel a few seconds later if it doesn't manage to reconnect. I believe the trade-off is worth it though.

Thanks for this great project.