fix left right icon and canavs center on label annotation

public/self/labeling.html

@@ -34,7 +34,8 @@
         csrf: '',
       }
 
-      var title_text = sessionStorage.getItem('return_url').split('/')[1]
+      var title_text = sessionStorage.getItem('return_url').split('/')[2]
+      console.log(sessionStorage.getItem('return_url').split('/'))
       title_text = "数据标注-" + title_text + '-OpenI'
       document.title = title_text