aodn/aodn-portal#1406 - use CRS:84 which actually has lon/lat coordinate...

... ordering rather than the default EPSG:4326 which doesn't

DO NOT MERGE UNTIL NEXT ITERATION

To be tested next iteration in content staging prior to release to production.  

Requires spatial extent update to be run in content staging after changes have been made/harvesters to run to update spatial extent to include the required SRS.