Removing unnecessary white spaces in lib/grunt/utils.js

Request Type: refactor

How to reproduce:

Component(s): misc core

Impact: small

Complexity: small

This issue is related to:

Detailed Description:

I removed unnecessary white space in lib/grunt/utils.js

Other Comments:

I'm not sure this change is suitable for PR. because the change like this is easily done with repo owners without PR). 
So if this PR is not suitable for angular, please close this. Only I hope improving code quality of angular.js