Fix declared argument name for numeric_maximum_size.
Fix declared argument name for numeric_maximum_size.

The previous commit changed the function to say 'typmod' rather than
'typemod', but I forgot to update the header file.

tpostgres-projects/tPostgres,jmcatamney/gpdb,snaga/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,kmjungersen/PostgresXL,kmjungersen/PostgresXL,snaga/postgres-xl,greenplum-db/gpdb,zeroae/postgres-xl,Postgres-XL/Postgres-XL,yazun/postgres-xl,adam8157/gpdb,zeroae/postgres-xl,xinzweb/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,arcivanov/postgres-xl,50wu/gpdb,ashwinstar/gpdb,pavanvd/postgres-xl,yazun/postgres-xl,jmcatamney/gpdb,lisakowen/gpdb,lisakowen/gpdb,ovr/postgres-xl,ashwinstar/gpdb,lisakowen/gpdb,postmind-net/postgres-xl,adam8157/gpdb,jmcatamney/gpdb,snaga/postgres-xl,lisakowen/gpdb,xinzweb/gpdb,adam8157/gpdb,50wu/gpdb,xinzweb/gpdb,50wu/gpdb,xinzweb/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,oberstet/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,pavanvd/postgres-xl,greenplum-db/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,ashwinstar/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,greenplum-db/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,adam8157/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,ovr/postgres-xl,arcivanov/postgres-xl,50wu/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,postmind-net/postgres-xl,kmjungersen/PostgresXL,techdragon/Postgres-XL,oberstet/postgres-xl,50wu/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,tpostgres-projects/tPostgres,oberstet/postgres-xl,50wu/gpdb,techdragon/Postgres-XL,arcivanov/postgres-xl,oberstet/postgres-xl,ovr/postgres-xl,arcivanov/postgres-xl,tpostgres-projects/tPostgres,techdragon/Postgres-XL,lisakowen/gpdb,ashwinstar/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,tpostgres-projects/tPostgres,yazun/postgres-xl,adam8157/gpdb,jmcatamney/gpdb,kmjungersen/PostgresXL,arcivanov/postgres-xl,postmind-net/postgres-xl,zeroae/postgres-xl,ashwinstar/gpdb,greenplum-db/gpdb,50wu/gpdb,oberstet/postgres-xl,zeroae/postgres-xl,jmcatamney/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,snaga/postgres-xl,xinzweb/gpdb,kmjungersen/PostgresXL,yazun/postgres-xl,50wu/gpdb,snaga/postgres-xl,postmind-net/postgres-xl,pavanvd/postgres-xl,ashwinstar/gpdb,jmcatamney/gpdb,xinzweb/gpdb,yazun/postgres-xl