remove possibility to enable "webif" logging to file

remove possibility to enable "webif" logging to file
# PLEASE DONT ENABLE LOGGING BY DEFAULT (OR COMMIT TO PLUGIN CVS)
# AND DONT ADD CONFIG OPTIONS WHICH HELPS NORMAL USERS TO ENABLE
# THIS KIND OF LOGGING !!!!!!!!!!!!!
# Twisted logging can't handle UTF8 correct,
# and enigma2 internal completely use UTF8 (for debug messages too)
# so the twisted logging code self generates frequently blue screens
# at various places in enigma2(not only in Webif) and the reason
# of this crashes is NOT visible in the normal enigma2 crashlogs
# We have spent much time into debugging this          Ghost 2007/11/15