minor bug fix to pass path to difference() in ios_config

The ios_config module needs to pass the path kwarg to difference when
specifying match=exact or strict.

lib/ansible/modules/network/ios/ios_config.py

@@ -291,6 +291,7 @@ def load_config(module, commands, result):
 def run(module, result):
     match = module.params['match']
     replace = module.params['replace']
+    path = module.params['parents']
 
     candidate = get_candidate(module)