Use deconstruct_array_builtin instead of deconstruct_array

Commit 062a844 introduced use of deconstruct_array when
deconstruct_array_builtin can be used instead.  Do that to save some
code.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/Zwi5g2GzlUX1NqxR@ip-10-97-1-34.eu-west-3.compute.internal

Author: alvherre

src/backend/catalog/pg_publication.c

@@ -1059,8 +1059,7 @@ pg_get_publication_tables(PG_FUNCTION_ARGS)
 		 * publication name.
 		 */
 		arr = PG_GETARG_ARRAYTYPE_P(0);
-		deconstruct_array(arr, TEXTOID, -1, false, TYPALIGN_INT,
-						  &elems, NULL, &nelems);
+		deconstruct_array_builtin(arr, TEXTOID, &elems, NULL, &nelems);
 
 		/* Get Oids of tables from each publication. */
 		for (i = 0; i < nelems; i++)