Remove useless argument from nbtree dedup function.

Peter Geoghegan <pg@bowt.ie>

Commit: 06e0652750e347bc3bf1dbb88d6a2a5d9b6f8faa
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2023-04-18T17:33:15Z
Releases: 16.0
Remove useless argument from nbtree dedup function.

_bt_dedup_pass()'s heapRel argument hasn't been needed or used since
commit cf2acaf4dc made deleting any existing LP_DEAD index tuples the
caller's responsibility.

Files