Remove double space (#427)

update-postgis.sh readability fixups from the community

Author: jaap3

update-postgis.sh

@@ -13,7 +13,7 @@ for DB in template_postgis "$POSTGRES_DB" "${@}"; do
     psql --dbname="$DB" -c "
         -- Upgrade PostGIS (includes raster)
         CREATE EXTENSION IF NOT EXISTS postgis VERSION '$POSTGIS_VERSION';
-        ALTER EXTENSION postgis  UPDATE TO '$POSTGIS_VERSION';
+        ALTER EXTENSION postgis UPDATE TO '$POSTGIS_VERSION';
 
         -- Upgrade Topology
         CREATE EXTENSION IF NOT EXISTS postgis_topology VERSION '$POSTGIS_VERSION';