FIX: print out the correct ip address when starting webagg (matplotlib#13065)

closes matplotlib#13055

Author: tacaswell

lib/matplotlib/backends/backend_webagg.py

@@ -321,7 +321,8 @@ def trigger_manager_draw(manager):
     def show():
         WebAggApplication.initialize()
 
-        url = "http://127.0.0.1:{port}{prefix}".format(
+        url = "http://{address}:{port}{prefix}".format(
+            address=WebAggApplication.address,
             port=WebAggApplication.port,
             prefix=WebAggApplication.url_prefix)