PMCP-6256: Fix Pinterest and Tumblr icons in Larva

[shawncook]

We noticed on Variety refresh that two of the social icons provided by Larva (Pinterest & Tumblr) are sized strangely compared to other social icons.

It appears that something during the image build process taps into an svg's viewBox attribute, which wasn't set for these two icons.

To solve the issue, I've brought over the same icons from Nova in order to bring them into alignment.

By making the viewBox attribute available, built SVG icons should no longer build with a NaN size.

Make sure you complete these items:

• [x] Updated root CHANGELOG.md with summary of changes under Unpublished section
• [x] npm run prod in this repo outputs expected changes (excepting the issue with re-ordered partials in larva-css algorithms partials - see LRVA-1885)
• [ ] If adding a new pattern, in the PR comment, included a screenshot and link to the static Vercel deployment
• [ ] If changes to build scripts or the Node.js server, tested changes in pmc-spark via a pre-release
• • If changes to build tools: npm scripts prod, lint, and dev scripts run as expected
• • If changes to Larva server: Static site generates as expected in a theme (avail. on a URL {brand}.stg.larva.pmcdev.io)

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