Update more angle-down icon instances

app/assets/javascripts/boards/components/modal/lists_dropdown.vue

@@ -38,7 +38,7 @@ export default {
       </span>
       {{ selected.title }}
       <icon
-        name="angle-down"
+        name="chevron-down"
       />
     </button>
     <div class="dropdown-menu dropdown-menu-selectable dropdown-menu-drop-up">

app/assets/javascripts/boards/components/project_select.vue

@@ -83,7 +83,7 @@ export default {
       >
         {{ selectedProjectName }}
         <icon
-          name="angle-down"
+          name="chevron-down"
         />
       </button>
       <div class="dropdown-menu dropdown-menu-selectable dropdown-menu-full-width">

app/assets/stylesheets/framework/dropdowns.scss

@@ -145,7 +145,7 @@
     right: 8px;
   }
 
-  .ic-angle-down {
+  .ic-chevron-down {
     position: absolute;
     top: $gl-padding-8;
     right: $gl-padding-8;