Fixes duplicate folders creation when zipping with subfolders

When zipping subfolders they were added twice in the zip (in the root folder and in their correct position).
With this fix now folders with subfolders are created correctly.

Zip/ZipUtilities.swift

@@ -84,7 +84,6 @@ internal class ZipUtilities {
                 }
                 else {
                     let directoryContents = expandDirectoryFilePath(path)
-                    processedFilePaths.appendContentsOf(directoryContents)
                 }
             }
         }