Replaced the script with updated version that works for both ensembl and...

Replaced the script with updated version that works for both ensembl and ensemblgenomes - ENSCORESW-1849

misc-scripts/stable_id_lookup/sql/indices.sql

+DROP INDEX stable_id_db_type ON stable_id_lookup;
+DROP INDEX stable_id_object_type ON stable_id_lookup;
+CREATE INDEX stable_id_db_type USING BTREE ON stable_id_lookup(stable_id,db_type);
+CREATE INDEX stable_id_object_type USING BTREE ON stable_id_lookup(stable_id,object_type);