(GH-1889) Fix: Removal of ApiKey broken

`remove_api_key` was previously not working properly. The API key string
did not get removed from the config file due to incorrect implementation
of Equals method  in ConfigFileApiKeySettings class.
Current commit fixes this issue.

src/chocolatey/infrastructure.app/configuration/ConfigFileApiKeySetting.cs

@@ -43,7 +43,7 @@ public override bool Equals(object obj)
             var item = (ConfigFileApiKeySetting) obj;
 
             return (Source == item.Source)
-                   && (Key == item.Source);
+                   && (Key == item.Key);
         }
 
         public override int GetHashCode()