I noticed Octoprint was disconnecting after a while, and after reading the logs, I came across this error:
```
Unhandled exception during run
Traceback (most recent call last):
File "/home/pi/klipper/klippy/klippy.py", line 171, in run
self.reactor.run()
File "/home/pi/klipper/klippy/reactor.py", line 176, in run
g_next.switch()
File "/home/pi/klipper/klippy/reactor.py", line 203, in _dispatch_loop
timeout = self._check_timers(eventtime)
File "/home/pi/klipper/klippy/reactor.py", line 82, in _check_timers
t.waketime = t.callback(eventtime)
File "/home/pi/klipper/klippy/extras/idle_timeout.py", line 62, in timeout_handler
return self.check_idle_timeout(eventtime)
File "/home/pi/klipper/klippy/extras/idle_timeout.py", line 59, in check_idle_timeout
return self.transition_idle_state(eventtime)
File "/home/pi/klipper/klippy/extras/idle_timeout.py", line 35, in transition_idle_state
logging.exception("idle timeout gcode execution")
NameError: global name 'logging' is not defined
```
I therefore added the missing import.
Signed-off-by: Samori Gorse <samori.gorse+github@gmail.com>
04c6e1f646