LPS-13222 web.xml in is missing from ext-web/WEB-INF when auto.deploy.unpack.war=false

As @lipusz found out, this bug was introduced few years ago: https://github.com/liferay/liferay-portal/commit/69b1c3bbacceead6d2e9b815ae74f970fe67a360 for https://issues.liferay.com/browse/LPS-11764. As you can see, all `web.xml` are excluded (notice the `**` pattern).