revlog: skip opener options to pass max_chain_len

We can directly set the option in the config object now.

mercurial/localrepo.py

@@ -1140,7 +1140,7 b' def resolverevlogstorevfsoptions(ui, req'
     # experimental config: format.maxchainlen
     maxchainlen = ui.configint(b'format', b'maxchainlen', maxchainlen)
     if maxchainlen is not None:
-        options[b'maxchainlen'] = maxchainlen
+        delta_config.max_chain_len = maxchainlen
 
     for r in requirements:
         # we allow multiple compression engine requirement to co-exist because

mercurial/revlog.py

@@ -628,8 +628,6 b' class revlog:'
         else:
             new_header = REVLOG_DEFAULT_VERSION
 
-        if b'maxchainlen' in opts:
-            self.delta_config.max_chain_len = opts[b'maxchainlen']
         if b'compengine' in opts:
             self.feature_config.compression_engine = opts[b'compengine']
         comp_engine_opts = self.feature_config.compression_engine_options