Easy spacing fixes, trailing stuff

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

weboob/applications/qvideoob/qvideoob.py

@@ -37,6 +37,7 @@ class QVideoob(QtApplication):
                            'backend': ''
                           }
              }
+
     def main(self, argv):
         self.load_backends(ICapVideo)
         self.load_config()