fix(icons): remove `xmlns:xlink` attribute from SVG
fix(icons): remove `xmlns:xlink` attribute from SVG

This was causing `setAttributeNS` to fail.

ng-lightning/ng-lightning,esarbanis/ng-lightning,dballance/ng-lightning,ppolyzos/ng-lightning,ppolyzos/ng-lightning,ihym/ng-lightning,dballance/ng-lightning,ppolyzos/ng-lightning,ihym/ng-lightning,ihym/ng-lightning,ng-lightning/ng-lightning,esarbanis/ng-lightning,dballance/ng-lightning,esarbanis/ng-lightning