fix constructor lookup for AOT runtime (#210)

This is fix for 'unable to find default constructor to type 'X' for AOT runtimes like iOS, WebGL etc.

Author: deniszykov

Assets/Colyseus/Runtime/GameDevWare.Serialization/Metadata/MetadataReflection.cs

@@ -197,11 +197,15 @@ public static bool TryGetConstructor(Type type, out Func<object> ctrFn, out Cons
 			ctrFn = null;
 			defaultConstructor = null;
 
-			if (AotRuntime || type.IsAbstract || type.IsInterface)
+			if (type.IsAbstract || type.IsInterface)
 				return false;
 
 			defaultConstructor = type.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic).FirstOrDefault(ctr => ctr.GetParameters().Length == 0);
 
+			if (AotRuntime && defaultConstructor != null) {
+				return true;
+			}
+
 			if (defaultConstructor == null)
 				return false;