Make protected branches / tags permission dropdowns consistent

app/assets/stylesheets/pages/projects.scss

@@ -822,8 +822,10 @@ pre.light-well {
   }
 }
-.new_protected_branch,
+.new-protected-branch,
 .new-protected-tag {
+  @include new-style-dropdown;
+
   label {
     margin-top: 6px;
     font-weight: $gl-font-weight-normal;
@@ -843,19 +845,9 @@ pre.light-well {
 .protected-branches-list,
 .protected-tags-list {
-  margin-bottom: 30px;
-
-  a {
-    color: $gl-text-color;
-
-    &:hover {
-      color: $gl-link-color;
-    }
-    &.is-active {
-      font-weight: $gl-font-weight-bold;
-    }
-  }
+  @include new-style-dropdown;
+  margin-bottom: 30px;
   .settings-message {
     margin: 0;