fix ignore of mimeTime set in mediaRenderer (#5683)

## Problem solved

CNCT-2634

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## PR-Codex overview
This PR focuses on updating the `isFetched` property in the `useResolvedMediaType.ts` file to include an additional condition based on `mimeType`. This change aims to enhance the logic determining if the media type has been successfully fetched.

### Detailed summary
- Updated the `isFetched` property:
  - Changed from `resolvedMimeType.isFetched` to `resolvedMimeType.isFetched || !!mimeType`.

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Author: dirtycajunrice

packages/thirdweb/src/react/web/ui/MediaRenderer/useResolvedMediaType.ts

@@ -43,6 +43,6 @@ export function useResolvedMediaType(
 
   return {
     mediaInfo: { url: resolvedUrl, mimeType: resolvedMimeType.data },
-    isFetched: resolvedMimeType.isFetched,
+    isFetched: resolvedMimeType.isFetched || !!mimeType,
   };
 }