Update app.py

using only bert without head

app.py

@@ -15,6 +15,7 @@ print('INFO: loading models')
 try:
     with open('embedder/embedder.pkl', 'rb') as f:
         embedder = pickle.load(f)
+        embedder.embedder = embedder.embedder.bert
     print('INFO: embedder loaded')
 except Exception as e:
     print(f"ERROR: loading embedder failed with: {str(e)}")