Fixed: Hidden files being ignored

(cherry picked from commit d493f8762fcb1684b44e182753c21d7a493db787)

Closes #4022

src/NzbDrone.Common/Disk/DiskProviderBase.cs

@@ -176,6 +176,7 @@ namespace NzbDrone.Common.Disk
 
             return _fileSystem.Directory.EnumerateFiles(path, "*", new EnumerationOptions
             {
+                AttributesToSkip = FileAttributes.System,
                 RecurseSubdirectories = recursive,
                 IgnoreInaccessible = true
             });
@@ -517,6 +518,7 @@ namespace NzbDrone.Common.Disk
 
             return di.EnumerateFiles("*", new EnumerationOptions
             {
+                AttributesToSkip = FileAttributes.System,
                 RecurseSubdirectories = recursive,
                 IgnoreInaccessible = true
             }).ToList();