Tabs Example 1 Missing Active Tab Function

[tylersloan]

Add tabButtonActive back to tabs example 1. this is needed for dynamic classnames to work.

Before:

• Missing function console error
• Text color isn't darker

After:

• No console error
• Text darker

Other Notes:

• Think this was just accidentally a few weeks ago (5c42b38#diff-68b08c735e1fdc2e5e02c8499cca0459d3199cee2e1f5645ed2a1da865bd9d86) 🤷‍♂️
• The active class list includes a class to make the tab background darker but the tabMarker itself has the darker background so there's some duplication a bit, but leaving as it isn't related to actual functionality

[tnylea]

Awesome! Thanks man 🕺