fix: added icon to walletconnect metadata

[ignaciosantise]

Description

Added icon link to WalletConnect metadata. It's useful for dapps that shows the connected wallet info.
Using the image uploaded in this repository -> https://github.com/MetaMask/metamask-mobile/blob/main/logo.png

Related issues

• none

Manual testing steps

• none

Screenshots/Recordings

The images show a dapp that uses the metadata to show connected wallet's name and icon

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[andreahaku]

better use a local image instead of fetching one online?

[andreahaku]

LGTM

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity in the last 90 days. It will be closed in 7 days. Thank you for your contributions.