[cleanup] Sort imports

Using https://github.com/PyCQA/isort

    isort -m VERTICAL_HANGING_INDENT --py 36 -l 80 --rr -n --tc .

yt_dlp/postprocessor/movefilesafterdownload.py

@@ -3,10 +3,10 @@ import shutil
 
 from .common import PostProcessor
 from ..utils import (
+    PostProcessingError,
     decodeFilename,
     encodeFilename,
     make_dir,
-    PostProcessingError,
 )