Remove title attributes that conflict with decorative images

[cjg89]

Description

Removes the title attribute from decorative images in person post lists. Should be the only instance in the theme where we explicitly include a title attribute on a generated image.

Motivation and Context

Apparently including a title attribute that has a value, along with an empty alt attribute, violates https://www.w3.org/TR/WCAG20-TECHS/H67.html.

How Has This Been Tested?

Reviewable in Dev.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires an update to the documentation.
• [ ] I have updated the documentation accordingly.