use & > .fa to prevent is-withicon bleedthrough

Author: mna

bulma/elements/controls.sass

@@ -183,7 +183,7 @@
   &:not(:last-child)
     margin-bottom: 10px
   &.is-withicon
-    .input + .fa
+    & > .fa
       +fa(14px, 20px)
       color: $text-light
       left: 6px