[Bug]: MetaMask Mobile not rejecting on wallet_getCapabilities unsupported method when connected via WalletConnect / inAppBrowser

### Describe the bug

Reported by CoW Swap:

> 1. Mobile browser
> 2. Connect MetaMask mobile wallet via WalletConnect
>
> As I mentioned above, we added EIP5792 support which implies using wallet_getCapabilities method.
> When we do the request, it switches the focus to MetaMask mobile app 🙁
> As you can see on the video, when I change the buying token, it imidiately navigates me to MetaMask.
> We already deployed hotfix for this issue, and disabled EIP5792 for mobile browsers connected via WalletConnect.
> If you want to reproduce it, you can use this link: https://swap-qstbz5egv-cowswap.vercel.app/
> The issue is also reproducible with iMToken wallet, but is not with Trust, just for your information.
> Thank you!
>
> To clarify, wallet_getCapabilities request triggers switching focus to the wallet for some reason, but it should not.

### Expected behavior

MetaMask returns an error on this method as unsupported

### Screenshots/Recordings

https://github.com/user-attachments/assets/3ff019ac-fa26-4aab-9ce0-185ce95220c3

### Steps to reproduce

1. Open MetaMask Mobile inappbrowser
2. Go to https://swap-qstbz5egv-cowswap.vercel.app/
3. Connect MetaMask via WalletConnect
4. Follow the steps in the attached video

### Error messages or log output

```shell

```

### Detection stage

In production (default)

### Version

7.39.0

### Build type

None

### Device

Android

### Operating system

Android

### Additional context

_No response_

### Severity

_No response_