Do nto install schema triggers (not in 9.6)

geocoder/extension/expected/00_install_test.out

@@ -1,6 +1,5 @@
 -- Install dependencies
 CREATE EXTENSION postgis;
-CREATE EXTENSION schema_triggers;
 CREATE EXTENSION plpythonu;
 CREATE EXTENSION cartodb;
 -- Mock the quota check

geocoder/extension/sql/00_install_test.sql

@@ -1,6 +1,5 @@
 -- Install dependencies
 CREATE EXTENSION postgis;
-CREATE EXTENSION schema_triggers;
 CREATE EXTENSION plpythonu;
 CREATE EXTENSION cartodb;