Minor: Remove variable from checkEveything method

src/main/java/eu/dnetlib/loginservice/controllers/HealthController.java

@@ -31,7 +31,6 @@ public class HealthController {
     @PreAuthorize("hasAnyAuthority('PORTAL_ADMINISTRATOR')")
     @RequestMapping(value = "/health_check/advanced", method = RequestMethod.GET)
     public Map<String, String> checkEverything() {
-        Map<String, String> response = configuration.getProperties();
-        return response;
+       return configuration.getProperties();
     }
 }