change icon class to swap-icon

css/civicrm.css

@@ -2581,7 +2581,7 @@ div.grippie {
   background-position: -3px -161px;
 }
 
-.crm-container .swap-target-assignee-icon {
+.crm-container .swap-icon {
   background-position: -82px -81px;
 }
 

templates/CRM/Activity/Form/Activity.tpl

@@ -157,7 +157,7 @@
       <td>
         <a href="#" class="button" id="swap_target_assignee">
           <span>
-            <div class="icon swap-target-assignee-icon"></div>{ts}Swap Target and Assignee Contacts{/ts}
+            <div class="icon swap-icon"></div>{ts}Swap Target and Assignee Contacts{/ts}
           </span>
         </div>
       </td>