Fix tray bugs (#5666)

* Make unit tests for tray behave correctly when item is disabled

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make multiple separators in tray originating from same extension not throw up

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

src/renderer/components/test-utils/get-application-builder.tsx

@@ -317,6 +317,10 @@ export const getApplicationBuilder = () => {
           throw new Error(`Tried to click tray menu item with ID ${id} which does not exist. Available IDs are: "${availableIds}"`);
         }
 
+        if (!menuItem.enabled.get()) {
+          throw new Error(`Tried to click tray menu item with ID ${id} which is disabled.`);
+        }
+
         await menuItem.click?.();
       },
     },