bundlerepo: remove unused 'repo' parameter Revision 7c231754a621 (filelog: add file function to open other filelogs, 2011-05-10) added a _file() method to revlog, which also required a 'repo' parameter to be added to bundlefilelog's constructor. The _file() method was then removed in b95a5bb58653 (filelog: remove unused _file method, 2015-01-22), which made the constructor parameter unused, so let's remove that too.