Updated mediawiki/extensions
Project: mediawiki/extensions/Math  0ddd3afaeaf98b6b3065979d2b6311f07ca05533

Cleanup after the removal of the PNG fallback

- remove the default "display: none" style on the SVG fallback
- remove the IE CSS hacks from ext.math.css
- add a client-side implementation of the PNG fallback

Bug: 71912
Change-Id: I91b11313aae25c4d05f8f2333d2f21537c9b8887