fix(forms): remove box shadow from form inputs other than selects

fixes #289
[fixes #106219428]

src/pivotal-ui/components/forms/forms.scss

@@ -557,31 +557,29 @@ them over a custom dropdown whenever possible.
 */
 
 .form-control {
-  @include button-shadow;
   padding: 8px 14px; // override bootstrap
   //-webkit-appearance: none;
   position: relative;
   &:hover, &:focus {
     border-color: $input-border-color-hover;
   }
 
-  &.active, &:active {
-    background-color: $input-bg-active;
-  }
-
   &.disabled, &:disabled {
     opacity: 0.5;
   }
 }
 
 select.form-control {
+  @include button-shadow;
   color: $link-color;
   font-weight: $input-font-weight;
+
   &:hover, &:focus {
     color: $input-color-hover;
   }
 
   &.active, &:active {
+    background-color: $input-bg-active;
     color: $input-color-active;
   }