Updated mediawiki/extensions
Project: mediawiki/extensions/Math  fd7fcc6ada354e71af22df54849f308519716844

Remove PNG image fallback image references

- These images currently return server errors

- We don't really want to load PNG images for browsers that support MathML or
  SVG. 

Bug: 69702
Change-Id: Idd339623efd19a0726b43a6c4adc2fcd832511f6