Revert .box-shadow() mixin JS change

Created by: WilliamStam

directive block with unrecognised format on line 253 in file 'mixins.less': [252]: // Multiple shadow solution from http://toekneestuck.com/blog/2012/05/15/less-css-arguments-variable/ [253]: @props: ~"@{arguments}".replace(/[\[\]]|\,\sX/g, ''); --^ [254]: -webkit-box-shadow: @props; [Done - Failed]

Process finished with exit code -5