Add endTrace call for case where NftsTab displays the empty banner

Author: MajorLift

ui/components/app/assets/nfts/nfts-tab/nfts-tab.js

@@ -85,6 +85,7 @@ export default function NftsTab() {
         referrer: ORIGIN_METAMASK,
       },
     });
+    endTrace({ name: TraceName.AccountOverviewNftsTab });
   }, [
     nftsLoading,
     showNftBanner,