s/prod/production for place summary gating logic (#3895)

Update the flask environment to gate place summary text on to be
"production" instead of "prod"

server/routes/place/html.py

@@ -80,7 +80,7 @@ def place(place_dcid=None):
     if os.environ.get('FLASK_ENV') in ['autopush', 'local']:
       # In autopush or local, show all summaries
       show_summary = True
-    if os.environ.get('FLASK_ENV') in ['staging', 'prod']:
+    if os.environ.get('FLASK_ENV') in ['staging', 'production']:
       # In staging or prod, only show summaries for places in allow list
       place_allow_list = current_app.config['PLACE_SUMMARY_ALLOW_LIST'] or []
       show_summary = place_dcid in place_allow_list