Fix "method_lines" issue in src/components/Buttons/button.js

[ibrahimbutt]

Function componentWillMount has 40 lines of code (exceeds 25 allowed). Consider refactoring.

https://codeclimate.com/github/ibrahimbutt/synthcal/src/components/Buttons/button.js#issue_5c0540b87e38c10001000024