[cleanup] Misc fixes

yt_dlp/downloader/common.py

@@ -108,7 +108,7 @@ class FileDownloader:
 
     @classproperty
     def FD_NAME(cls):
-        return re.sub(r'(?<!^)(?=[A-Z])', '_', cls.__name__[:-2]).lower()
+        return re.sub(r'(?<=[a-z])(?=[A-Z])', '_', cls.__name__[:-2]).lower()
 
     @staticmethod
     def format_seconds(seconds):

yt_dlp/downloader/fragment.py

@@ -23,7 +23,7 @@ class HttpQuietDownloader(HttpFD):
     def to_screen(self, *args, **kargs):
         pass
 
-    console_title = to_screen
+    to_console_title = to_screen
 
 
 class FragmentFD(FileDownloader):