expedition rewards (#16972)

Co-authored-by: deltanedas <@deltanedas:kde.org>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Salvage/SpawnSalvageMissionJob.cs

@@ -133,6 +133,7 @@ public sealed class SpawnSalvageMissionJob : Job<bool>
         expedition.Station = Station;
         expedition.EndTime = _timing.CurTime + mission.Duration;
         expedition.MissionParams = _missionParams;
+        expedition.Difficulty = _missionParams.Difficulty;
 
         // Don't want consoles to have the incorrect name until refreshed.
         var ftlUid = _entManager.CreateEntityUninitialized("FTLPoint", new EntityCoordinates(mapUid, Vector2.Zero));