Merging AENetworks fix from ytdl-org

[merval]

Fixes #228

Please follow the guide below

• You will be asked some questions, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your pull request (like that [x])
• Use Preview tab to see how your pull request will actually look like

---

Before submitting a pull request make sure you have:

• At least skimmed through adding new extractor tutorial and youtube-dl coding conventions sections
• Searched the bugtracker for similar pull requests
• Checked the code with flake8

In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

---

Description of your pull request and other information

This is a fix that was merged into ytdl-org to fix aenetworks. Merging here as well.

[pukkandan]

@merval Is there any particular reason you made this into a separate PR when it is already part of #280? If you have added any new code, I will need to remove the corresponding part from my PR

[merval]

No, that was me being a dumb ass and not realizing it was already in there. Sorry about that :-/ I'll close this out.