Harmonize BeforeError handling

Author: VirrageS

app.go

@@ -263,8 +263,6 @@ func (a *App) Run(arguments []string) (err error) {
 	if a.Before != nil {
 		beforeErr := a.Before(context)
 		if beforeErr != nil {
-			_, _ = fmt.Fprintf(a.Writer, "%v\n\n", beforeErr)
-			_ = ShowAppHelp(context)
 			a.handleExitCoder(context, beforeErr)
 			err = beforeErr
 			return err

command.go

@@ -161,7 +161,6 @@ func (c Command) Run(ctx *Context) (err error) {
 	if c.Before != nil {
 		err = c.Before(context)
 		if err != nil {
-			_ = ShowCommandHelp(context, c.Name)
 			context.App.handleExitCoder(context, err)
 			return err
 		}