fdo#69309 rename share/registry/postgresqlsdbc.xcd to postgresql.xcd

Change-Id: Ie7c9200310ab24e4d2636849b133e515f266d5c9
Reviewed-on: https://gerrit.libreoffice.org/8183
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>