Fix icon not detected if project path isn't empty
Fix icon not detected if project path isn't empty

https://github.com/poggit/poggit/blob/fa9f9b1610ec5b5713a50a5ed51e1bdc20978875/src/poggit/release/PluginRelease.php#L227 tries to add the project path to the icon path twice.
SOF3/poggit,poggit/poggit,SOF3/poggit,poggit/poggit,poggit/poggit,SOF3/poggit,poggit/poggit