Update useTokenPrices.tsx

fix type error

Author: issa-me-sush

src/hooks/useTokenPrices.tsx

@@ -3,7 +3,7 @@ const X_API_Key = process.env.NEXT_PUBLIC_X_API_KEY;
 const fetcher = async (url : string) => {
   const response = await fetch(url, {
     headers: {
-      'x-api-key': X_API_Key,
+      'x-api-key': X_API_Key ?? '',
     },
   });
   if (!response.ok) {