Enable SECURE_SSL_REDIRECT setting for Heroku demos

app.json

@@ -18,12 +18,10 @@
     "LOG_LEVEL": "INFO",
     "PROD_DETAILS_STORAGE": "product_details.storage.PDDatabaseStorage",
     "RUN_SUPERVISOR": "True",
+    "SECURE_SSL_REDIRECT": "True",
     "SECRET_KEY": {
       "description": "A secret key for verifying the integrity of signed cookies, though we don't use them.",
       "generator": "secret"
-    },
-    "SENTRY_DSN": {
-      "description": "Configure error reporting to Sentry"
     }
   }
 }