Add correct config file name to verbose server log

Server logging uses the wrong variable when displaying
the configuration file name. This update changes the
log to use the `config` variable.

Author: mdhender

commands/hugo.go

@@ -391,7 +391,7 @@ func InitializeConfig(subCmdVs ...*cobra.Command) (*deps.DepsCfg, error) {
 		return nil, err
 	}
 
-	cfg.Logger.INFO.Println("Using config file:", viper.ConfigFileUsed())
+	cfg.Logger.INFO.Println("Using config file:", config.ConfigFileUsed())
 
 	themeDir := c.PathSpec().GetThemeDir()
 	if themeDir != "" {