Add specialized icon for .drawio files

[AVAtarMod]

• [X] I agree to follow the Code of Conduct that this project adheres to.
• [X] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe. Default icon for .drawio files is not related to drawio files because has x-office-document icon. But modern icon packs such as Papirus have special icon for .drawio files.

Describe the solution you'd like Replace <icon name="x-office-document" /> to <icon name="application-vnd.jgraph.mxfile" /> at /usr/share/mime/packages/drawio.xml:6 file (for mime-type type="application/vnd.jgraph.mxfile">)

Describe alternatives you've considered Add <icon name="x-office-document" /> to the existed definition if mime standard support multiple icon definitions.

Additional context OS: Fedora 36

[github-actions[bot]]

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