Fixup for prvious patch

The problem was:
Error output from freebox-switch-stations1:
 Traceback (most recent call last):
   File "/etc/munin/plugins/freebox-switch-stations1", line 587, in <module>
     print_config()
   File "/etc/munin/plugins/freebox-switch-stations1", line 155, in print_config
     print('{}.label {}'.format(station, stations[station_safe]['hostname']))
 KeyError: 'PCS_Systemtechnik_GmbH_(08:00:27:15:43:BF)'
Service 'freebox-switch-stations1' exited with status 1/0.

main.py

@@ -151,8 +151,7 @@ def print_config():
         print('graph_args --lower-limit 0')
         stations = get_switch_stations(switch_index)
         for station in stations:
-            station_safe = station.replace(" ", "_")
-            print('{}.label {}'.format(station, stations[station_safe]['hostname']))
+            print('{}.label {}'.format(station, stations[station]['hostname']))
             print('{}.draw AREASTACK'.format(station_safe))
     elif mode.startswith('freebox-switch'):
         switch_index = mode[-1]