[SDK] Fix: Wallet avatar styles in ConnectButton and Modal (#5422)

i just want my cat back

<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on updating the styling of the `img` elements in the `DetailsModal` component to ensure they maintain aspect ratio and are responsive.

### Detailed summary
- Changed the `width` of the first `img` to `"100%"` and added `objectFit: "cover"`.
- Updated the second `img` to have `height` and `width` set to `"100%"`, along with `objectFit: "cover"`.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

<!-- end pr-codex -->

packages/thirdweb/src/react/web/ui/ConnectWallet/Details.tsx

@@ -224,8 +224,9 @@ export const ConnectedWalletDetails: React.FC<{
             alt=""
             src={avatarSrc}
             style={{
-              width: "100%",
               height: "100%",
+              width: "100%",
+              objectFit: "cover",
             }}
           />
         ) : (
@@ -410,8 +411,9 @@ function DetailsModal(props: {
           <img
             src={avatarSrc}
             style={{
-              width: iconSize.xxl,
-              height: iconSize.xxl,
+              height: "100%",
+              width: "100%",
+              objectFit: "cover",
             }}
             alt=""
           />