Rename nbtree tuple macros.

Peter Geoghegan <pg@bowt.ie>

Commit: fcf3b6917bd8f6f9f463e3e42e53d6ff9612e327
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2019-12-17T01:49:45Z
Releases: 13.0
Rename nbtree tuple macros.

Rename two function-style macros, removing the word "inner".  This makes
things more consistent.

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