Fix mis-aligned Navigationview footer and save buttons in the settings page

[HO-COOH]

This improves the layout/appearance of the settings UI footer, by reducing
the height of the main content footer to match the navigation view footer.

[zadjii-msft]

@DHowett let's get this in for the bug bash today

[lhecker]

Original commit message:

Summary of the Pull Request

As title suggest

Detailed Description of the Pull Request / Additional comments

I made this

to this

Because it bugs me every time 😅

I searched for ways to get the actual size of the NavigationView footer items so it does not use the hard-coded property Height , but was not able to find one. Let me know if there is alternative ways.

[lhecker]

I hope you don't mind, but I've edited your PR message. We don't usually commit GitHub image links into our main branch - the images might not always remain online after all. Since it's such a simple commit I've kept the message at a bare minimum.

[ghost]

Hello @DHowett!

Because this pull request has the AutoMerge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

p.s. you can customize the way I help with merging this pull request, such as holding this pull request until a specific person approves. Simply @mention me (@msftbot) and give me an instruction to get started! Learn more here.

[ghost]

🎉Windows Terminal Preview v1.15.186 has been released which incorporates this pull request.:tada:

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