Fix ugly state of dropdown

when editing a dropdown,
but not changing anything you end up in an ugly state
Fixes #13215

app/assets/stylesheets/pages/issuable.scss

@@ -75,7 +75,7 @@
       border: none;
     }
 
-    span {
+    span:not(.select2-container span) {
       margin-top: 7px;
       display: inline-block;
     }