py3: convert opts to bytes in cmdutil.dorecord()

commands.commit() calls cmdutil.dorecord() where opts are passed as unicodes
being keyword arguments. This patch converts them back to bytes as they are
required.

mercurial/cmdutil.py

@@ -115,6 +115,7 b' def recordfilter(ui, originalhunks, oper'
 def dorecord(ui, repo, commitfunc, cmdsuggest, backupall,
             filterfn, *pats, **opts):
     from . import merge as mergemod
+    opts = pycompat.byteskwargs(opts)
     if not ui.interactive():
         if cmdsuggest:
             msg = _('running non-interactively, use %s instead') % cmdsuggest