sane-tag-music: fix path-based tag derivation when path contains "." or ".."

pkgs/additional/sane-scripts/src/sane-tag-music

@@ -699,6 +699,7 @@ class MediaFile:
 
     @staticmethod
     def new(f: str) -> 'MediaFile':
+        f = os.path.normpath(f)  #< transform "./artist/album/file" -> "artist/album/file", so that path-based parsing doesn't have to care
         ext = os.path.splitext(f)[1][1:].lower()
         tag_field_names = TagFieldNames()
         meta = None