DROP ROLE regress_role_limited_admin at end of test

This is required by project policy, and I overlooked the need for
it (again) by accident.

Reported by Álvaro Herrara.

Discussion: http://postgr.es/m/20230126114659.x3yuypot7p6zj73c@alvherre.pgsql

Author: robertmhaas

src/test/regress/expected/create_role.out

@@ -227,5 +227,6 @@ DROP ROLE regress_tenant;
 DROP ROLE regress_tenant2;
 DROP ROLE regress_rolecreator;
 DROP ROLE regress_role_admin;
+DROP ROLE regress_role_limited_admin;
 DROP ROLE regress_role_super;
 DROP ROLE regress_role_normal;

src/test/regress/sql/create_role.sql

@@ -210,5 +210,6 @@ DROP ROLE regress_tenant;
 DROP ROLE regress_tenant2;
 DROP ROLE regress_rolecreator;
 DROP ROLE regress_role_admin;
+DROP ROLE regress_role_limited_admin;
 DROP ROLE regress_role_super;
 DROP ROLE regress_role_normal;