Fix views not loading when using card_options (#118)

The logic to check whether an entity is hidden has been changed.

Instead of checking the `entity_id` field which is always undefined, the
updated logic now dynamically references the `entity.entity_id` within 
the card options of the strategy options.

---------

Co-authored-by: Ferry Cools <fcools@digilive.nl>

src/views/AbstractView.ts

@@ -149,7 +149,7 @@ abstract class AbstractView {
         entity =>
           entity.entity_id.startsWith(domain + ".")
           && !entity.hidden_by
-          && !Helper.strategyOptions.card_options?.entity_id.hidden
+          && !Helper.strategyOptions.card_options?.[entity.entity_id]?.hidden
       ).map(entity => entity.entity_id),
     };
   }