Update app2.py

app2.py

@@ -21,7 +21,9 @@ main_body_instance = MainBody()
 
 
 def load_categories():
-    f = open("categories_general.txt", "r")
+    #f = open("categories_general.txt", "r")
+    f = open("categories_arxiv.txt", "r")
+    
     list_categories = f.read().splitlines() 
     return list_categories