Fix watchdog init (#34)

No need to init watchdog timer before startup.

Author: damarco

zigpy_deconz/zigbee/application.py

@@ -28,8 +28,6 @@ def __init__(self, api, database_file=None):
         self.discovering = False
         self.version = 0
 
-        asyncio.ensure_future(self._reset_watchdog())
-
     async def _reset_watchdog(self):
         while True:
             await self._api.write_parameter(NETWORK_PARAMETER['watchdog_ttl'][0], 3600)