Fix team member create

Signed-off-by: kolaente <k@knt.li>

pkg/models/teams.go

@@ -68,7 +68,7 @@ type TeamMember struct {
 	// Used under the hood to manage team members
 	UserID int64 `xorm:"int(11) not null INDEX" json:"-"`
 	// Whether or not the member is an admin of the team. See the docs for more about what a team admin can do
-	Admin bool `xorm:"tinyint(1) INDEX null" json:"admin"`
+	Admin bool `xorm:"null" json:"admin"`
 
 	// A timestamp when this relation was created. You cannot change this value.
 	Created timeutil.TimeStamp `xorm:"created not null" json:"created"`