FR: Windows: Fill out SystemStats::getFullUserName

JUCE sadly returns the logon name on Windows when calling SystemStats::getFullUserName.

It turns out we can actually retrieve the full name on Windows. This PR does the trick on Win10 and Win11: Windows: Added proper support for SystemStats::getFullUserName(). by jrlanglois · Pull Request #1075 · juce-framework/JUCE · GitHub