fix(Entity): Avoid for..in iteration in sorted state adapter

[livthomas]

I have just noticed that the changes in commit f871540 introduced to the sorted state adapter the same problem I have already fixed in the unsorted state adapter. So I'm adding the reproducer to those tests as well.

Just one question: Where can we expect these fixes to be released? Is there going to be version 5.0.2 anytime soon?

[coveralls]

Coverage decreased (-0.003%) to 92.76% when pulling 235bec3 on livthomas:sorted-adapter-for-in into 779d689 on ngrx:master.

[MikeRyanDev]

There will probably be a 5.1.0 at some point. Not sure when, but if you need the fixes soon then I would recommend using the nightlies for now.

Thanks for these fixes!