largefiles: fix status -S reporting of subrepos (issue3231) Wrapping the status command will only invoke overridestatus() and set the lfstatus field for the top level repository. Wrapping the status function is required to set the field on child repositories. Previously, status -S would report large files in a subrepo as '?' regardless of their actual states, and was inconsistent with what status would report from within that subrepo.