Remove CE/EE diff in app/assets/stylesheets/framework/callout.scss

Caused by https://gitlab.com/gitlab-org/gitlab-ee/commit/6c5aabd7835bb225a5d690af85aa78a5dd240d5a

• CE: https://gitlab.com/gitlab-org/gitlab-ce/blob/77ecb67432be523f4158cb26978b6ee3a1a86566/app/assets/stylesheets/framework/callout.scss
• EE: https://gitlab.com/gitlab-org/gitlab-ee/blob/c5dded9d21825b49cb4c429929f23a4e88db586c/app/assets/stylesheets/framework/callout.scss

has a small diff

diff --git a/app/assets/stylesheets/framework/callout.scss b/app/assets/stylesheets/framework/callout.scss
index 643b20c56bc..c5bb2a1256a 100644
--- a/app/assets/stylesheets/framework/callout.scss
+++ b/app/assets/stylesheets/framework/callout.scss
@@ -9,7 +9,9 @@
 .bs-callout {
   margin: $gl-padding 0;
   padding: $gl-padding;
-  border-left: 3px solid $border-color;
+  border-color: $border-color;
+  border-style: solid;
+  border-width: 0 0 0 3px;
   color: $text-color;
   background: $gray-light;
 
@@ -48,6 +50,10 @@
   background-color: $blue-100;
   border-color: $blue-200;
   color: $blue-700;
+
+  h4 {
+    color: $blue-700;
+  }
 }
 
 .bs-callout-success {