Clean up the hardcoded url of the panosc search api server

This can be read form config now:

  server = server ? req.params.server : "http://dau-dm-01.esrf.fr"; //global.gServerConfig.panosc.search.server.url;
  port = port ? req.params.port : 5000; //global.gServerConfig.panosc.search.server.port;

https://gitlab.esrf.fr/icat/icat-plus/-/blob/master/app/controllers/panosc.controller.js#L9