Remove optional parameter.

Author: johndoknjas

chess/engine.py

@@ -1875,11 +1875,11 @@ def _parse_uci_bestmove(board: chess.Board, args: str) -> BestMove:
     return BestMove(move, ponder)
 
 
-def _chain_config(a: ConfigMapping, b: ConfigMapping, with_hash_reordering: bool = True) -> Iterator[Tuple[str, ConfigValue]]:
+def _chain_config(a: ConfigMapping, b: ConfigMapping) -> Iterator[Tuple[str, ConfigValue]]:
     merged = dict(a)
     for k, v in b.items():
         merged.setdefault(k, v)
-    if with_hash_reordering and 'Hash' in merged and 'Threads' in merged:
+    if 'Hash' in merged and 'Threads' in merged:
         hash_val = merged['Hash']
         del merged['Hash']
         merged['Hash'] = hash_val