Add alt tags for default email
Add alt tags for default email

fixes #CNVS-6437

Steps
1. Go to http://localhost:3000/profile/settings
2. Verify alt text of "Default email address" is on default email
address on the side of the page.
3. Verify alt text of "Remove email address" is on the remove email
address icon on the side of the page.
4. Screen reader should be able to pick this up.

Change-Id: I72c88a9945599a01dc2fe6f054e30bb59275a3fc
Reviewed-on: https://gerrit.instructure.com/21801
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>
Product-Review: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

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