fix: allow signing on permissioned account

[elefantel]

Description

This PR enables the account the dapp is connected to be able to sign when using the deeplinking communication layer of the iOS native SDK. Currently the account can sign if it is both the connected to account and the selected account.

Manual testing steps

1. Request connection to MM wallet from dapp
2. Choose any account other than the selected account as the account to connect to
3. Then sign a message. The wallet should be able to sign using the account the dapp is connected to, regardless of whether it's the selected account or not.

Screenshots/Recordings

Before

before.MP4

After

after.MP4

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.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud