Set owner id to zero when GetRegistrationToken for repo (#31725) (#31729)

Backport #31725 by @wolfogre

Fix #31707.

It's split from #31724.

Although #31724 could also fix #31707, it has change a lot so it's not a
good idea to backport it.

Co-authored-by: Jason Song <i@wolfogre.com>

routers/api/v1/repo/action.go

@@ -505,7 +505,7 @@ func (Action) GetRegistrationToken(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/RegistrationToken"
 
-	shared.GetRegistrationToken(ctx, ctx.Repo.Repository.OwnerID, ctx.Repo.Repository.ID)
+	shared.GetRegistrationToken(ctx, 0, ctx.Repo.Repository.ID)
 }
 
 var _ actions_service.API = new(Action)