fix(icon): Update demo fonts from 21px to 24px.

fixes #4569. Closes #4799.

Author: programmist

src/components/icon/demoFontIconsWithClassnames/script.js

@@ -16,7 +16,7 @@ angular
       $scope.sizes = [
         {size:48,padding:10},
         {size:36,padding:6},
-        {size:21,padding:2},
+        {size:24,padding:2},
         {size:12,padding:0}
       ];