Update structure.sql for PostgreSQL CVE-2018-1058
Update structure.sql for PostgreSQL CVE-2018-1058

https://wiki.postgresql.org/wiki/A_Guide_to_CVE-2018-1058:_Protect_Your_Search_Path

StatesOfJersey/e-petitions,StatesOfJersey/e-petitions,StatesOfJersey/e-petitions,StatesOfJersey/e-petitions