Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  7684df129d3960008b8f1bde116586ee7b8bc0bf

Improve parser test for bug 52760 (close tags are being stripped).

Split out the test for bug 52760 from the test for bug 17663, which should
make it more clear what's going on.

Change-Id: Iec7133e919a4ef35b781c92197009d889a659fd9