Fix typo to support multiple tracks.

[rosiel]

GitHub Issue: Oral History Transcriptions seems the most relevant

• Other Relevant Links (Google Groups discussion, related pull requests,
  Release pull requests, etc.)

What does this Pull Request do?

Attempts at loading multiple tracks into an islandora video for alternate captions/subtitles failed; the problem seems to be an unclosed tag in the twig template.

What's new?

Close the tag in the twig template.

• Does this change add any new dependencies? no
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)? no
• Could this change impact execution of existing code? yes, to work as expected

How should this be tested?

• Add two differently labeled subtitle tracks to an islandora video. Only one will show up. If you inspect the <video> element it'll have a stub <track within the other <track (which wasn't closed properly)
• With this PR, both should show up and you'll see two <track>s.

Documentation Status

• Does this change existing behaviour that's currently documented? no, sadly, but that's how I found it.
• Does this change require new pages or sections of documentation? Working on it.
• Who does this need to be documented for? Users expecting to add subtitles/captions.
• Associated documentation pull request(s): ___ or documentation issue ___

Additional Notes:

Any additional information that you think would be helpful when reviewing this
PR.

Interested parties

Tag (@ mention) interested parties or, if unsure, @Islandora/8-x-committers

[seth-shaw-unlv]

👍