Ensure that the profile header view always returns a minimum size that is visible

[SergioEstevao]

| 📘 Part of: # |
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Fixes #

When testing the subscription purchase flows on the profile on the iPad, I noticed that the profile view disappeared when multi-task / split mode where activated.

The reason is that the ProfileHeaderView returns a size of zero and that make the profile view controller header size method to set a zero height for the header and the view never recovers that.

The fix will ensure that a minimum size is always returned.

To test

• Start the app on a iPad
• Go to Profile tab
• Activate multitask mode on the iPad and split view with Safari for example
• Check that on the different multitask modes the Account header is always visible

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

	2 Warnings
⚠️	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.
⚠️	This PR is assigned to the milestone 7.71 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by 🚫 Danger

[bjtitus]

✅ Verified the issue on trunk
✅ Verified the Profile Header is now shown in split screen