UnusedUse - fix false negative when namespace shortname equals imported namespace shortname

UnusedUse - fix false negative when namespace shortname equals imported namespace shortname
No, this fixer do not introduce multiple namespace support.
On master there is lack of it, here too.
This fix fix only false negative situation when namespace shortname is equal to imported namespace shortname, example can be seen on diff in `Finder/MagentoFinder.php`