update #9066 Always show Password field on link account sign in page (#9147)

routers/user/auth.go

@@ -788,6 +788,7 @@ func LinkAccountPostSignIn(ctx *context.Context, signInForm auth.SignInForm) {
 	u, err := models.UserSignIn(signInForm.UserName, signInForm.Password)
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
+			ctx.Data["user_exists"] = true
 			ctx.RenderWithErr(ctx.Tr("form.username_password_incorrect"), tplLinkAccount, &signInForm)
 		} else {
 			ctx.ServerError("UserLinkAccount", err)