Make levels 1-based in pg_log_backend_memory_contexts()

Both pg_get_process_memory_contexts() and pg_backend_memory_contexts
have 1-based levels, whereas pg_log_backend_memory_contexts() was using
0-based levels.  Align these.

This results in slightly saner behavior from MemoryContextStatsDetail()
in regards to the max_level.  Previously it would stop at 1 level before
the maximum requested level rather than at that level.

Reported-by: Atsushi Torikoshi <torikos...@oss.nttdata.com>
Author: Atsushi Torikoshi <torikos...@oss.nttdata.com>
Author: David Rowley <drowle...@gmail.com
Reviewed-by: Melih Mutlu <m.melihmu...@gmail.com>
Reviewed-by: Rahila Syed <rahilasye...@gmail.com>
Discussion: https://postgr.es/m/395ea5d4fe190480efa95bf533485...@oss.nttdata.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d9e03864b6b4c7fe2988393c22e2355786c4c1f7

Modified Files
--------------
src/backend/utils/mmgr/mcxt.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

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