revlog: skip opener option to pass delta_both_parents value

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

mercurial/localrepo.py

@@ -1089,10 +1089,9 b' def resolverevlogstorevfsoptions(ui, req'
     if chunkcachesize is not None:
         data_config.chunk_cache_size = chunkcachesize
 
-    deltabothparents = ui.configbool(
+    delta_config.delta_both_parents = ui.configbool(
         b'storage', b'revlog.optimize-delta-parent-choice'
     )
-    options[b'deltabothparents'] = deltabothparents
     dps_cgds = ui.configint(
         b'storage',
         b'revlog.delta-parent-search.candidate-group-chunk-size',

mercurial/revlog.py

@@ -630,8 +630,6 b' class revlog:'
 
         if b'maxchainlen' in opts:
             self.delta_config.max_chain_len = opts[b'maxchainlen']
-        if b'deltabothparents' in opts:
-            self.delta_config.delta_both_parents = opts[b'deltabothparents']
         dps_cgds = opts.get(b'delta-parent-search.candidate-group-chunk-size')
         if dps_cgds:
             self.delta_config.candidate_group_chunk_size = dps_cgds