Suggest OpenType MATH fonts instead of TrueType TeX fonts

[Fred-wang]

For some historical reasons, the firefox package suggests fonts-lyx which contains "TeX's Computer Modern Fonts" that were needed for the MathML support of Gecko 1.8 (https://developer.mozilla.org/en-US/docs/Mozilla/MathML_Project/FontsMozilla1.8). Support for these fonts has been removed for a very long time and it is now recommended to use modern OpenType MATH fonts instead (https://developer.mozilla.org/en-US/docs/Mozilla/MathML_Project/Fonts). Hence the firefox package should instead suggest the following math fonts:

* Latin Modern = "computer modern" style used by default in LaTeXn compatible with the old true type fonts.
* STIX fonts (fonts-stix) = fonts created by a consortium of scientific orgs, with large unicode coverage for math symbols.

(Note that Debian already suggests STIX and I opened https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=792012)

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Fred-wang (fred-wang)]

FYI, the equivalent patch for Debian has just been accepted:

> https://tracker.debian.org/news/708342
> * debian/control*: Suggest Latin Modern Math instead of MathJax TeX fonts
> for MathML rendering, and remove suggestion for Asana Math. Thanks
> Frédéric Wang. Closes: #792012.