fixed OneClassPerFileFixer with ::class

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #377
| License       | MIT
Exportable is not right word, traversable with the the PHPStorm debugger.
It shows the object but once you expand it its empty. ;) its also possible my xdebug version is a bit old.