Files starting with `##` are always detected as Matlab files

When a file has no ending and the first two letters are ##, it’s always detected and syntax-highlighted as a Matlab file.

I remember having that issue since about three to four years in Fedora. I don’t understand how not even adding an extension alters the context-type.

Here with a file, purely consisting of ##:

> gio info <FILE> | rg content
  standard::content-type: text/x-matlab
  standard::fast-content-type: application/octet-stream

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