[extractors] Remove remnants of sportbox extractor (#11954)

diff --git a/youtube_dl/extractor/extractors.py b/youtube_dl/extractor/extractors.py
index aa235bec1aeef1090c30e7a7b4f4af3cdfece6c2..eaf3676df7e327b577325861d18840f9bff8dfce 100644 (file)
--- a/youtube_dl/extractor/extractors.py
+++ b/youtube_dl/extractor/extractors.py
@@ -888,10 +888,7 @@ from .spiegeltv import SpiegeltvIE
 from .spike import SpikeIE
 from .stitcher import StitcherIE
 from .sport5 import Sport5IE
-from .sportbox import (
-    SportBoxIE,
-    SportBoxEmbedIE,
-)
+from .sportbox import SportBoxEmbedIE
 from .sportdeutschland import SportDeutschlandIE
 from .sportschau import SportschauIE
 from .srgssr import (