Prevent transition animation on hover within buttongroups

Change-Id: I652270fc4f26d55ace7126948d8442fed69f430b
diff --git a/dev/scss/base/buttongroup.scss b/dev/scss/base/buttongroup.scss
index 85b2527..42dfbdb 100644
--- a/dev/scss/base/buttongroup.scss
+++ b/dev/scss/base/buttongroup.scss
@@ -26,7 +26,8 @@
       border-width: $border-size 0;
 
       &:hover {
-	      @include choose-hover;
+	@include choose-hover;
+        transition: none;
       }
 
       &:first-child {