Passthrough the configured MIME.

[jordandukart]

What does this Pull Request do?

Allows a configured MIME type from an Islandora action to be passed through to Hypercube.

What's new?

The MIME type of text/plain is no longer hardcoded and a configured MIME type is now used.

How should this be tested?

Create an action that uses Hypercube (OCR, hOCR) and specify a MIME type that isn't text/plain.

Ingest an object and media that will create a derivative with Hypercube to be triggered (for example a book, pages and media).

The resultant File entities within Drupal have the set MIME type that matches the one configured.

Interested parties

@Islandora/8-x-committers

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c2c44b9) 76.72% compared to head (8048e5a) 76.72%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 4.x #175 +/- ## ========================================= Coverage 76.72% 76.72% Complexity 160 160 ========================================= Files 6 6 Lines 782 782 ========================================= Hits 600 600 Misses 182 182 ```

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[seth-shaw-asu]

So, this works as described. The only hesitation I have is that the Media entity is still showing text/plain instead of the new mime type on the file.

[seth-shaw-asu]

Although I suppose that is a Drupal issue; not a Crayfish one...