Error when uploading an .h5p file through upload form widget

MR ready for review.

This MR should use the simple array syntax. [] instead of array().

https://www.drupal.org/docs/develop/standards/php/php-coding-standards#a... →

Array syntax fixed, ready for re-review.

I tested the Content > H5P Library > Upload form as well as the H5P upload field widget on both D10 and D11 using both the 2.0.0-alpha6 release and the issue branch. In D10, both work fine. In D11, I confirmed the bug exists in 2.0.0-alpha6 and is fixed in the issue branch. Marking this RTBC.

Ok, I'm still adjusting the to new merge/credit workflow. Hopefully that worked. Thank you! Merged and marked as fixed.

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