Fix for Twitch Video Stats

[spenceshady]

Proposed changes

Corrects the typing for the VideoPlayerComponent for Twitch so Video Stats can be shown.

Fixes SevenTV/SevenTV#278

Types of changes

What types of changes does your code introduce to 7TV?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged

I don't think any documentation updates are needed, but please let me know if so.