Fix owner team access mode value in team_unit table (#23675)

All `access_mode` value of Owner Teams are 0(AccessModeNone) in
`team_unit` table, which should be 4(AccessModeOwner)
In `team` table:

![image](https://user-images.githubusercontent.com/18380374/227409457-1b9660ae-8cf7-49c8-a013-1850b46baebc.png)
In `team_unit` table:

![image](https://user-images.githubusercontent.com/18380374/227409429-a793dd90-4ae1-4191-b95b-e288c591f9fd.png)

ps: In https://github.com/go-gitea/gitea/pull/23630, `access_mode` in
`team_unit` is used to check the team unit permission, but I found that
user can not see issues in owned org repos.

models/migrations/migrations.go

@@ -479,6 +479,8 @@ var migrations = []Migration{
 	NewMigration("Improve Action table indices v3", v1_20.ImproveActionTableIndices),
 	// v250 -> v251
 	NewMigration("Change Container Metadata", v1_20.ChangeContainerMetadataMultiArch),
+	// v251 -> v252
+	NewMigration("Fix incorrect owner team unit access mode", v1_20.FixIncorrectOwnerTeamUnitAccessMode),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v1_20/v251.go

@@ -0,0 +1,47 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_20 //nolint
+
+import (
+	"code.gitea.io/gitea/modules/log"
+
+	"xorm.io/xorm"
+)
+
+func FixIncorrectOwnerTeamUnitAccessMode(x *xorm.Engine) error {
+	type UnitType int
+	type AccessMode int
+
+	type TeamUnit struct {
+		ID         int64    `xorm:"pk autoincr"`
+		OrgID      int64    `xorm:"INDEX"`
+		TeamID     int64    `xorm:"UNIQUE(s)"`
+		Type       UnitType `xorm:"UNIQUE(s)"`
+		AccessMode AccessMode
+	}
+
+	const (
+		// AccessModeOwner owner access
+		AccessModeOwner = 4
+	)
+
+	sess := x.NewSession()
+	defer sess.Close()
+
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	count, err := sess.Table("team_unit").
+		Where("team_id IN (SELECT id FROM team WHERE authorize = ?)", AccessModeOwner).
+		Update(&TeamUnit{
+			AccessMode: AccessModeOwner,
+		})
+	if err != nil {
+		return err
+	}
+	log.Debug("Updated %d owner team unit access mode to belong to owner instead of none", count)
+
+	return sess.Commit()
+}

models/organization/org.go

@@ -341,6 +341,7 @@ func CreateOrganization(org *Organization, owner *user_model.User) (err error) {
 			OrgID:      org.ID,
 			TeamID:     t.ID,
 			Type:       tp,
+			AccessMode: perm.AccessModeOwner,
 		})
 	}