[openwrt] Simplified OpenVpn converter

Author: nemesifier

netjsonconfig/backends/openwrt/converters.py

@@ -505,11 +505,7 @@ def __get_encryption(self, wireless):
 class OpenVpn(BaseOpenVpn):
     def __get_vpn(self, vpn):
         config = super(OpenVpn, self).__get_vpn(vpn)
-        if 'disabled' in config:
-            config['enabled'] = not config['disabled']
-            del config['disabled']
-        else:
-            config['enabled'] = True
+        config['enabled'] = not config.get('disabled', False)
         config.update({
             '.name': logical_name(config.pop('name')),
             '.type': 'openvpn'