Fix SSPI user creation (#28948)

Fixes #28945

Setting the avatar is wrong and creating a random password is equal to
leave it empty.

services/auth/sspi.go

@@ -11,7 +11,6 @@ import (
 	"sync"
 
 	"code.gitea.io/gitea/models/auth"
-	"code.gitea.io/gitea/models/avatars"
 	"code.gitea.io/gitea/models/db"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/base"
@@ -169,10 +168,7 @@ func (s *SSPI) newUser(ctx context.Context, username string, cfg *sspi.Source) (
 	user := &user_model.User{
 		Name:     username,
 		Email:    email,
-		Passwd:          gouuid.New().String(),
 		Language: cfg.DefaultLanguage,
-		UseCustomAvatar: true,
-		Avatar:          avatars.DefaultAvatarLink(),
 	}
 	emailNotificationPreference := user_model.EmailNotificationsDisabled
 	overwriteDefault := &user_model.CreateUserOverwriteOptions{