Add fullscreen toggle name

Viewer/assets/templates/default/navbar.html

@@ -502,7 +502,7 @@
             <span class="icon help-icon"></span>
         </button>
         {{/unless}} {{#unless hideFullscreen}}
-        <button class="fullscreen fullscreen-button" title="{{text.fullscreenButton}} ">
+        <button class="fullscreen fullscreen-button" title="{{text.fullscreenButton}} " name="fullscreenToggle">
             <span class="icon fullscreen-icon"></span>
         </button>
         {{/unless}}