fix(snap): Use default buttons when hideSnapsBranding is true

[GuillaumeRx]

Description

This PR makes the button not use the snap branding when the hideSnapsBranding flag is set to true.

It also fixes an issue with the snap homepage footer having a margin when only one button is rendered in the footer.

The snap-footer-button was also renamed snap-ui-renderer__footer-button to conform to the conventional naming of ui elements used in the snap-ui-renderer

Related issues

Fixes: N/A

Manual testing steps

1. Go to test-snaps
2. Try the preinstalled example snap

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension 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 failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud

[metamaskbot]

Missing release label release-12.5.0 on PR. Adding release label release-12.5.0 on PR and removing other release labels(release-12.6.0), as PR was added to branch 12.5.0 when release was cut.