PEP 8 whitespace cleanup. (#20783)

* PEP 8 E271 whitespace cleanup.
* PEP 8 W293 whitespace cleanup.
* Fix whitespace issue from recent PR.

lib/ansible/modules/network/bigswitch/bigmon_chain.py

@@ -123,7 +123,7 @@ def chain(module):
 
     if state in ('absent') and not config_present:
         module.exit_json(changed=False)
-        
+
     if state in ('present'):
         response = rest.put('chain[name="%s"]' % name, data={'name': name})
         if response.status_code == 204: