Remove duplicate bus.AddHandler() (#9289)

`bus.AddHandler("sql", SetUsingOrg)` is already called on line 24.

Very minor change.

pkg/services/sqlstore/user.go

@@ -28,7 +28,6 @@ func init() {
 	bus.AddHandler("sql", SearchUsers)
 	bus.AddHandler("sql", GetUserOrgList)
 	bus.AddHandler("sql", DeleteUser)
-	bus.AddHandler("sql", SetUsingOrg)
 	bus.AddHandler("sql", UpdateUserPermissions)
 	bus.AddHandler("sql", SetUserHelpFlag)
 }