Fix imports

sass/elements/form.sass

@@ -1,6 +1,3 @@
-@import "../utilities/controls.sass"
-@import "../utilities/mixins.sass"
-
 =form-control
   +control
   @each $name, $pair in $colors
@@ -238,7 +235,7 @@
         margin-right: 10px
       &.is-expanded
         flex-grow: 1
-        flex-shrink: 0
+        flex-shrink: 1
     &.is-grouped-centered
       justify-content: center
     &.is-grouped-right