clients/reth: fix merge netsplit block in mapper (ethereum#986)

Author: Rjected

clients/reth/mapper.jq

@@ -52,7 +52,7 @@ def to_bool:
     "londonBlock": env.HIVE_FORK_LONDON|to_int,
     "arrowGlacierBlock": env.HIVE_FORK_ARROW_GLACIER|to_int,
     "grayGlacierBlock": env.HIVE_FORK_GRAY_GLACIER|to_int,
-    "parisBlock": env.HIVE_MERGE_BLOCK_ID|to_int,
+    "mergeNetsplitBlock": env.HIVE_MERGE_BLOCK_ID|to_int,
     "terminalTotalDifficulty": env.HIVE_TERMINAL_TOTAL_DIFFICULTY|to_int,
     "terminalTotalDifficultyPassed": env.HIVE_TERMINAL_TOTAL_DIFFICULTY_PASSED|to_bool,
     "shanghaiTime": env.HIVE_SHANGHAI_TIMESTAMP|to_int,