[tvnet] Improve and fix issues (closes #15462)

youtube_dl/extractor/extractors.py

@@ -1139,6 +1139,7 @@ from .tvc import (
 from .tvigle import TvigleIE
 from .tvland import TVLandIE
 from .tvn24 import TVN24IE
+from .tvnet import TVNetIE
 from .tvnoe import TVNoeIE
 from .tvnow import (
     TVNowIE,
@@ -1306,7 +1307,6 @@ from .vrv import (
     VRVSeriesIE,
 )
 from .vshare import VShareIE
-from .vtv import VTVIE
 from .medialaan import MedialaanIE
 from .vube import VubeIE
 from .vuclip import VuClipIE