LPS-33626 portlet-data.xml fix

Hey Julio,

This should fix the tests.

The original problem was that the portlet-data.xml files did not contain the <xml> opening tag, which made them not proper xml files. Because of this the import did not parse them so a NPE has thrown.

I've fix this in my previous PR to this ticket, but as Brian did not merge all of the things, he missed this one.

But this will fix it.

Thanks,

Máté

cc: @KocsisDaniel