Remove useless __all__ in modules

They bring nothing of value (we never use import * anyway) and introduce
a maintenance burden.

The __all__ that I left might not be very useful either but at least
they are not a pain to maintain; they are also used by pyflakes in some
cases.

modules/youtube/pages.py

@@ -36,10 +36,6 @@ from weboob.tools.browser import BasePage, BrokenPageError, BrowserIncorrectPass
 from weboob.tools.json import json
 
 
-__all__ = ['LoginPage', 'LoginRedirectPage', 'ForbiddenVideo', 'ForbiddenVideoPage',
-           'VerifyAgePage', 'VerifyControversyPage', 'VideoPage']
-
-
 class LoginPage(BasePage):
     def on_loaded(self):
         errors = []

modules/youtube/video.py

@@ -21,9 +21,6 @@
 from weboob.capabilities.video import BaseVideo
 
 
-__all__ = ['YoutubeVideo']
-
-
 class YoutubeVideo(BaseVideo):
     @classmethod
     def id2url(cls, _id):