[redbean] OnServerHeartbeat() is broken in non-daemon mode

[quantmage]

First of all, thank you for the great library and its ongoing improvements! 👍

I noted an issue after I rebased my repo to 3.3.4 today. It turns out that OnServerHeartbeat() is not being called in the interactive (REPL) mode until a key input is given. I tracked it down to this change: 0e0398c#diff-a937cc5818818785e079eab14ff76fa5db080fe9bd902d1ab21aa546aa79c7d1R7153

Changing it back to EventLoop(100) (100ms timeout) fixed the problem for me. Was there any reason to change the poll timeout to -1 (i.e. no timeout)?