Fixed generic method creation

IPA.Loader/Config/Stores/GeneratedStoreImpl.cs

@@ -1604,8 +1604,8 @@ namespace IPA.Config.Stores
 
                 // for now, we assume that its a generated type implementing IGeneratedStore
                 var IGeneratedStore_Serialize = typeof(IGeneratedStore).GetMethod(nameof(IGeneratedStore.Serialize));
-                var IGeneratedStoreT_CopyFrom = typeof(IGeneratedStore<>).GetMethod(nameof(IGeneratedStore<object>.CopyFrom))
-                    .MakeGenericMethod(member.Type);
+                var IGeneratedStoreT_CopyFrom = typeof(IGeneratedStore<>).MakeGenericType(member.Type)
+                    .GetMethod(nameof(IGeneratedStore<object>.CopyFrom));
 
                 if (!member.IsVirtual)
                 {