add .HIF file support

[mayonnaisehypernova]

• Resolves: [Bug]: HIF photos don't get preview generated #46408

Summary

I added hif as a supported file extension to the resources/config/mimetypemapping.dist.json to support .HIF files in nextcloud, especially for the preview generation and display of image files.

TODO

• Review and resolve any conflicts

[github-actions]

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