Remove unnecessary heap_tuple_needs_freeze argument.

Peter Geoghegan <pg@bowt.ie>

Commit: cf879d3069a3f025824b4a3fa3086137b34bad48
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2022-02-25T02:31:07Z
Releases: 15.0
Remove unnecessary heap_tuple_needs_freeze argument.

The buffer argument hasn't been used since the function was first added
by commit bbb6e559c4.  The sibling heap_prepare_freeze_tuple function
doesn't have such an argument either.  Remove it.

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