Fix running core.step when receiving an event while not waiting

When `time_to_wake` was <= 0, so when a coroutine needed to be executed 
as soon as possible, we didn't check for events, so we only performed a 
`core.step` with the blink timer.
This resulted in jerky reactions to input.

data/core/init.lua

@@ -1411,7 +1411,7 @@ function core.run()
           local cursor_time_to_wake = dt + 1 / config.fps
           next_step = now + cursor_time_to_wake
         end
-        if time_to_wake > 0 and system.wait_event(math.min(next_step - now, time_to_wake)) then
+        if system.wait_event(math.min(next_step - now, time_to_wake)) then
           next_step = nil -- if we've recevied an event, perform a step
         end
       else

docs/api/system.lua

@@ -61,10 +61,10 @@ function system.poll_event() end
 ---
 ---Wait until an event is triggered.
 ---
----@param timeout number Amount of seconds, also supports fractions
----of a second, eg: 0.01
+---@param timeout? number Amount of seconds, also supports fractions
+---of a second, eg: 0.01. If not provided, waits forever.
 ---
----@return boolean status True on success or false if there was an error.
+---@return boolean status True on success or false if there was an error or if no event was received.
 function system.wait_event(timeout) end
 
 ---