Some maven URLs are wrong

On a purldb instance with data from an old packagedb instance, we have maven packages where the download URLs are not valid. For example, a package has the download URL of https://repo1.maven.org/maven2/xdoclet-plugin-beaninfo/xdoclet-plugin-beaninfo/20051012.090849/xdoclet-plugin-beaninfo-20051012.090849.jar, which is invalid. The correct download URL should be https://repo1.maven.org/maven2/xdoclet-plugins/xdoclet-plugin-beaninfo/20051012.090849/xdoclet-plugin-beaninfo-20051012.090849.jar