change mobile icon for **Points** tab

[emilydrakesmith]

Describe your changes

• Change the icon used for the Points tab on mobile devices on the /account page

Link the related issue

none

Checklist before requesting a review

• Is this PR ready for merge? (Please convert to a draft PR otherwise)
• I have performed a self-review of my code.
• Did I request feedback from a team member prior to the merge?
• Does my code following the style guide at docs/CODING-STYLE.md?

Instructions for Reviewers

Functionalities or workflows that should specifically be tested.
Navigate to the /account route for any user and observe the tabs. The Points tab should have a unique icon.

Environmental conditions that may result in expected but differential behavior.

• must be viewing the mobile version of the web app

If relevant, list additional work to complete pre-merge (delete logging, code abstraction, etc)

None, ready for merge. Deferred work is documented in Issue #3542

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