Fix require external registration password (#8885)

* Fix require external registration password

* Fix ctx on error condition by @jolheiser

routers/user/auth.go

 
 // LinkAccount shows the page where the user can decide to login or create a new account
 func LinkAccount(ctx *context.Context) {
-	ctx.Data["DisablePassword"] = !setting.Service.RequireExternalRegistrationCaptcha || setting.Service.AllowOnlyExternalRegistration
+	ctx.Data["DisablePassword"] = !setting.Service.RequireExternalRegistrationPassword || setting.Service.AllowOnlyExternalRegistration
 	ctx.Data["Title"] = ctx.Tr("link_account")
 	ctx.Data["LinkAccountMode"] = true
 	ctx.Data["EnableCaptcha"] = setting.Service.EnableCaptcha && setting.Service.RequireExternalRegistrationCaptcha
 
 // LinkAccountPostSignIn handle the coupling of external account with another account using signIn
 func LinkAccountPostSignIn(ctx *context.Context, signInForm auth.SignInForm) {
-	ctx.Data["DisablePassword"] = setting.Service.AllowOnlyExternalRegistration
+	ctx.Data["DisablePassword"] = !setting.Service.RequireExternalRegistrationPassword || setting.Service.AllowOnlyExternalRegistration
 	ctx.Data["Title"] = ctx.Tr("link_account")
 	ctx.Data["LinkAccountMode"] = true
 	ctx.Data["LinkAccountModeSignIn"] = true
 func LinkAccountPostRegister(ctx *context.Context, cpt *captcha.Captcha, form auth.RegisterForm) {
 	// TODO Make insecure passwords optional for local accounts also,
 	//      once email-based Second-Factor Auth is available
-	ctx.Data["DisablePassword"] = !setting.Service.RequireExternalRegistrationCaptcha || setting.Service.AllowOnlyExternalRegistration
+	ctx.Data["DisablePassword"] = !setting.Service.RequireExternalRegistrationPassword || setting.Service.AllowOnlyExternalRegistration
 	ctx.Data["Title"] = ctx.Tr("link_account")
 	ctx.Data["LinkAccountMode"] = true
 	ctx.Data["LinkAccountModeRegister"] = true