daemon: S1033: unnecessary guard around call to delete (gosimple)

```
daemon/container_operations.go:787:2: S1033: unnecessary guard around call to delete (gosimple)
	if _, ok := container.NetworkSettings.Networks[n.ID()]; ok {
	^
```

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/config/config.go

@@ -493,9 +493,7 @@ func findConfigurationConflicts(config map[string]interface{}, flags *pflag.Flag
 	if len(unknownKeys) > 0 {
 		unknownNamedConflicts := func(f *pflag.Flag) {
 			if namedOption, ok := f.Value.(opts.NamedOption); ok {
-				if _, valid := unknownKeys[namedOption.Name()]; valid {
-					delete(unknownKeys, namedOption.Name())
-				}
+				delete(unknownKeys, namedOption.Name())
 			}
 		}
 		flags.VisitAll(unknownNamedConflicts)

daemon/container_operations.go

@@ -784,9 +784,8 @@ func (daemon *Daemon) connectToNetwork(container *container.Container, idOrName
 		EndpointSettings: endpointConfig,
 		IPAMOperational:  operIPAM,
 	}
-	if _, ok := container.NetworkSettings.Networks[n.ID()]; ok {
-		delete(container.NetworkSettings.Networks, n.ID())
-	}
+
+	delete(container.NetworkSettings.Networks, n.ID())
 
 	if err := daemon.updateEndpointNetworkSettings(container, n, ep); err != nil {
 		return err