Add code count rule for valgrind suppression missed in 6be5ea33.
Add code count rule for valgrind suppression missed in 6be5ea33.

6be5ea33 changed valgrind suppression file naming but failed to update the code count rules.

pgmasters/backrest,pgmasters/backrest,pgbackrest/pgbackrest,pgbackrest/pgbackrest,pgbackrest/pgbackrest