demo: remove console.log polyfill
demo: remove console.log polyfill

Bootstrap 4 dropped IE9 support so we don't need
console.log polyfill any more

Closes #1249

ktriek/ng-bootstrap,pkozlowski-opensource/core,ng-bootstrap/ng-bootstrap,ng-bootstrap/ng-bootstrap,pkozlowski-opensource/core,jnizet/ng-bootstrap,chenyuzhcy/ng-bootstrap,maxokorokov/core,fbasso/ng-bootstrap,Foxandxss/ng-bootstrap,ng-bootstrap/core,mschoudry/ng-bootstrap,ktriek/ng-bootstrap,johnbenz13/ng-bootstrap,chenyuzhcy/ng-bootstrap,jnizet/ng-bootstrap,Foxandxss/ng-bootstrap,Xaiid/ng-bootstrap,ktriek/ng-bootstrap,maxokorokov/core,jnizet/ng-bootstrap,pkozlowski-opensource/core,benouat/ng-bootstrap,maxokorokov/core,ng-bootstrap/ng-bootstrap,jnizet/ng-bootstrap,johnbenz13/ng-bootstrap,Xaiid/ng-bootstrap,ng-bootstrap/core,ACGC/ng-bootstrap,ACGC/ng-bootstrap,chenyuzhcy/ng-bootstrap,mschoudry/ng-bootstrap,ACGC/ng-bootstrap,benouat/ng-bootstrap,fbasso/ng-bootstrap,Foxandxss/ng-bootstrap,fbasso/ng-bootstrap,benouat/ng-bootstrap,ng-bootstrap/core,johnbenz13/ng-bootstrap,mschoudry/ng-bootstrap,ktriek/ng-bootstrap,ng-bootstrap/ng-bootstrap,fbasso/ng-bootstrap,benouat/ng-bootstrap,maxokorokov/core,Xaiid/ng-bootstrap