Added fallback for loadSession in case someone might have disconnected.

[LennardF1989]

After investigating an issue from Discord (https://discord.com/channels/826809653181808651/1077036810082979974), the following behavior is observed:

• When a token expires, the game will request a new one (see hotfix Fixed an issue where refresh_token was not properly served #190).
• When this request fails, or something else entirely causes the game to think you are offline, the game will show the "reconnect popup" (and sometimes it will automatically do so!).
• If you click reconnect, you go through a full login flow (/config, /token, /GetProfile, etc).
• If you are in an active mission, the game will also called /Load.

This last one is a problem. The original version would only ever look for persisted sessions on the filesystem, however, this is not the case when you just lost connection for whatever reason (and restored it without restarting Peacock). This kind of leads into #165, but is for another day.

This fix will make sure it will always fallback to the contractSessions that may still be in memory.

This can have an unintended side effect when you try to load a save that is not persisted on the filesystem, but happens to be the exact one you are currently playing. This however is a highly unlikely scenario to occur and doesn't outweigh the benefits of this fix. Disconnecting and losing progress is annoying.

[moonysolari]

when you try to load a save that is not persisted on the filesystem

I kinda don't see how that could happen?