Remove padding-right override on form selects

Fixed upstream in Foundation for Apps. See:
https://github.com/zurb/foundation-apps/pull/416

This partially reverts commit e10c5e9f28.

Signed-off-by: Alex Coles <alex@alexbcoles.com>

app/assets/stylesheets/content/_forms.sass

@@ -386,10 +386,6 @@ fieldset.form--fieldset
   @extend %input-style
   line-height: 1.5
 
-  // TODO: remove padding property once upstream PR merged:
-  // https://github.com/zurb/foundation-apps/pull/416
-  padding-right: $form-padding + rem-calc(18px)
-
   &[multiple]
     background-image: none
     padding-right: $form-padding