Add radio buttons in sort dropdown menu to indicate selected item

T-91

h/static/styles/common.scss

@@ -328,6 +328,27 @@ html {
   visibility: visible;
 }
 
+.dropdown-menu__row {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+}
+
+.dropdown-menu-radio {
+  display: inline-block;
+  width: 12px;
+  height: 12px;
+  border-radius: 50%;
+  margin-left: 8px;
+  margin-right: 8px;
+
+  border: 1px solid $color-silver;
+}
+
+.dropdown-menu-radio.is-selected {
+  border: 4px solid $color-dove-gray;
+}
+
 .masthead {
   margin-bottom: 1em;
 

h/templates/client/sort_dropdown.html

@@ -15,9 +15,11 @@
     <i class="h-icon-sort"></i>
   </button>
   <ul class="dropdown-menu pull-right" role="menu">
-    <li ng-repeat="sortOption in sortOptions"
+    <li class="dropdown-menu__row"
+        ng-repeat="sortOption in sortOptions"
         ng-click="onChangeSortBy({sortBy: sortOption})"
-        ><span ng-class="sortOption === sortBy ? 'dropdown-menu__radio-btn--selected' : ''"
+        ><span class="dropdown-menu-radio"
+               ng-class="{'is-selected' : sortOption === sortBy}"
         ></span><a class="dropdown-menu__link" href="">{{sortOption}}</a></li>
   </ul>
 </span>