Updated mediawiki/extensions
Project: mediawiki/extensions/BetaFeatures  578095f1777d89c7a780dba36c6f5231ad48758c

Fix border colours in BetaFeatures

I used the wrong border colour in  I3cfb2149ec182.

Change-Id: Ib1e791cc7774a8b9026aad66b12617242b885e4f