fix: restore button line-height

Author: vesameskanen

sass/base/_button.scss

@@ -8,6 +8,7 @@ button {
   border-width: 0;
   cursor: pointer;
   font-family: $button-font-family;
+  line-height: $line-height-normal;
   position: relative;
   background-color: transparent;
   transition: none;