Change style for ng-style to fix progress bars not working with IE in the metrics view

As stated in angularjs official docs : "Use ng-style tags instead of style="{{ someCss }}". The latter works in Chrome and Firefox but does not work in Internet Explorer <= 11 (the most recent version at time of writing)."

fix  #793
Merge pull request #828 from unknownboy/fix-for-#793

Change style for ng-style to fix progress bars not working with IE