PWV-2: Change on ServerConfiguration logic to make it extensible

Packages/ohif-study-list/both/schema/servers.js

@@ -165,11 +165,6 @@ export const PublicServerConfig = new SimpleSchema({
     ui: {
         type: UISettings,
         label: 'UI Settings'
-    },
-    custom: {
-        type: Object,
-        label: 'Custom Settings',
-        optional: true
     }
 });