Reduce grid column size for Person teaser lists

[skoolbus39]

Reduce minimum size from 20rem to 17.76rem:

Before:

.unlcms-teaser-person-list {
    grid-template-columns: repeat( auto-fit, minmax(20rem, 1fr) );
}

After:

.unlcms-teaser-person-list {
    grid-template-columns: repeat( auto-fit, minmax(17.76rem, 1fr) );
}