switch remaining GRANTs to configurable web user

fixes #252

data/country_name.sql

@@ -295,7 +295,6 @@ CREATE INDEX idx_country_name_country_code ON country_name USING btree (country_
 --
 
 REVOKE ALL ON TABLE country_name FROM PUBLIC;
-GRANT SELECT ON TABLE country_name TO "www-data";
 
 
 --

data/gb_postcode_table.sql

@@ -24,4 +24,3 @@ CREATE TABLE gb_postcode (
     CONSTRAINT enforce_srid_geometry CHECK ((st_srid(geometry) = 4326))
 );
 
-GRANT SELECT ON TABLE gb_postcode TO "www-data";