Distribution Wizard version picker during XE upgrade list only versions =< 4.2

To reproduce:
Have a instance running another version of XWiki. Install 5.2-milestone2 and at the first run, in Distribution Wizard, it won't be able to guess the version you're running (it seems to be another issue spotted by LM), so click on the button to pick your own version, and in the next panel, you'll have a list of XWiki versions, but it goes until 4.2, not beyond.