largefiles: remove unnecessary clearing of status fields At the end of lfilesrepo.status(), we clear the lists of unknown, ignored and clean files, depending on the values of 'listunknown' etc. The lists originate from other calls to status(), and it is only 'clean' that may get updated after the calls. Let's remove the need to clear any of the lists by explicitly only adding to 'clean' when 'listclean' is true.