Some fixes for map init. (#2355)

Robust.UnitTesting/Server/Maps/MapLoaderTest.cs

@@ -101,6 +101,7 @@ entities:
             protoMan.RegisterType(typeof(EntityPrototype));
 
             protoMan.LoadDirectory(new ResourcePath("/Prototypes"));
+            protoMan.Resync();
         }
 
         [Test]

Robust.UnitTesting/Shared/Serialization/InheritanceSerializationTest.cs

@@ -60,6 +60,7 @@ namespace Robust.UnitTesting.Shared.Serialization
 
             prototypeManager.RegisterType(typeof(EntityPrototype));
             prototypeManager.LoadString(Prototypes);
+            prototypeManager.Resync();
 
             var entityManager = IoCManager.Resolve<IEntityManager>();