SystemStats::getComputerName asserts when hostname has utf8 characters

#1

This should probably be fixed like this:

String SystemStats::getComputerName()
{
    char name[256] = { 0 };
    
    if (gethostname (name, sizeof (name) - 1) == 0)
        return String::fromUTF8 (name, 256).upToLastOccurrenceOf (".local", false, true);

    return {};
}