In a development environment, we often run in HTTP.
The problem is that WorkAdventure will attempt to load maps using the HTTP protocol (even if the map is on a remote server that is available only in HTTPS).
This commit adds a "fallback". If we are in HTTP (so in a development environment) and if the map fails to load correctly, we will try again, but in HTTPS.
This allows development environment to load maps hosted on a HTTPS enabled server easily.