remotefilelog: do not specify an explicit version for repack

Differential Revision: https://phab.mercurial-scm.org/D6024

hgext/remotefilelog/repack.py

@@ -338,7 +338,7 b' def _runrepack(repo, data, history, pack'
     packer = repacker(repo, data, history, fullhistory, category,
                       gc=garbagecollect, isold=isold, options=options)
 
-    with datapack.mutabledatapack(repo.ui, packpath, version=2) as dpack:
+    with datapack.mutabledatapack(repo.ui, packpath) as dpack:
         with historypack.mutablehistorypack(repo.ui, packpath) as hpack:
             try:
                 packer.run(dpack, hpack)