Update page-client.tsx (solana-foundation#433)

Fees not shown correctly when there are none. Not quite sure why that
happens locally yet. But this fixes it.

<img width="1316" alt="image"
src="https://github.com/user-attachments/assets/8947bccd-08c9-4f47-a458-291ce03887bd"
/>

<img width="983" alt="image"
src="https://github.com/user-attachments/assets/d320ed34-6b60-4ac2-bdd1-377d6b90208e"
/>

app/tx/[signature]/page-client.tsx

@@ -322,7 +322,7 @@ function StatusCard({ signature, autoRefresh }: SignatureProps & AutoRefreshProp
                     </tr>
                 )}
 
-                {fee && (
+                {fee !== undefined && (
                     <tr>
                         <td>Fee ({explorerConfig.symbol})</td>
                         <td className="text-lg-end">