MapManager warning cleanup on tests (#36940)

lets see if this works.

Content.IntegrationTests/Tests/GameRules/NukeOpsTest.cs

@@ -181,7 +181,7 @@ public sealed class NukeOpsTest
         }
 
         Assert.That(!entMan.EntityExists(nukieStationEnt)); // its not supposed to be a station!
-        Assert.That(server.MapMan.MapExists(gridsRule.Map));
+        Assert.That(mapSys.MapExists(gridsRule.Map));
         var nukieMap = mapSys.GetMap(gridsRule.Map!.Value);
 
         var targetStation = entMan.GetComponent<StationDataComponent>(ruleComp.TargetStation!.Value);