Fix spacing linter issue

Author: alvaromontoro

src/warnings/features/_head.scss

@@ -7,8 +7,8 @@ head {
 }
 
 /* E0017: title element must not be empty */
-head meta[name = "viewport"][content *= "maximum-scale=1" i],
-head meta[name = "viewport"][content *= "user-scalable=no" i] {
+head meta[name="viewport"][content*="maximum-scale=1" i],
+head meta[name="viewport"][content*="user-scalable=no" i] {
   @include vectorMessage(warning, "W0016", 458, "The display zoom/scale", "has been disabled.");
   display: block;
   border: 0;