check orgId on delete

pkg/api/dashboard_snapshot.go

@@ -356,6 +356,9 @@ func (hs *HTTPServer) DeleteDashboardSnapshot(c *contextmodel.ReqContext) respon
 	if queryResult == nil {
 		return response.Error(http.StatusNotFound, "Failed to get dashboard snapshot", nil)
 	}
+	if queryResult.OrgID != c.OrgID {
+		return response.Error(http.StatusUnauthorized, "OrgID mismatch", nil)
+	}
 
 	if queryResult.External {
 		err := deleteExternalDashboardSnapshot(queryResult.ExternalDeleteURL)