fix(buttonSmall): fix line-height for button-small

Closes #2023

Author: mhartington

Diff for: scss/_button-bar.scss

@@ -26,7 +26,7 @@
 .button-bar > .button {
   @include flex(1);
   display: block;
-  
+
   overflow: hidden;
 
   padding: 0 16px;
@@ -52,3 +52,10 @@
     border-radius: 0px $button-border-radius $button-border-radius 0px;
   }
 }
+
+.button-bar > .button-small {
+  &:before,
+  .icon:before {
+    line-height: 28px;
+  }
+}