sidedata: send the correct revision data for wireproto v2

When no sidedata is present, rawdata() and revision() are the same. But
as soon as sidedata is present, the way it is currently stored will
change the rawdata and that is not desired here, so switch to the
correct data accessor.

Differential Revision: https://phab.mercurial-scm.org/D9445

mercurial/wireprotov2server.py

@@ -1049,7 +1049,7 b' def changesetdata(repo, proto, revisions'
         followingdata = []
 
         if b'revision' in fields:
-            revisiondata = cl.rawdata(node)
+            revisiondata = cl.revision(node)
             followingmeta.append((b'revision', len(revisiondata)))
             followingdata.append(revisiondata)