Allow registration when button is hidden (#8238)

routers/user/auth.go

@@ -1008,7 +1008,7 @@ func SignUpPost(ctx *context.Context, cpt *captcha.Captcha, form auth.RegisterFo
 	ctx.Data["RecaptchaSitekey"] = setting.Service.RecaptchaSitekey
 
 	//Permission denied if DisableRegistration or AllowOnlyExternalRegistration options are true
-	if !setting.Service.ShowRegistrationButton {
+	if setting.Service.DisableRegistration {
 		ctx.Error(403)
 		return
 	}