fix ajax headers not propagated to navigator

src/viewer.js

@@ -515,6 +515,8 @@ $.Viewer = function( options ) {
             crossOriginPolicy: this.crossOriginPolicy,
             animationTime:     this.animationTime,
             drawer:            this.drawer.getType(),
+            loadTilesWithAjax: this.loadTilesWithAjax,
+            ajaxHeaders:       this.ajaxHeaders,
         });
     }