Updated mediawiki/extensions
Project: mediawiki/extensions/Petition  309e44fdffedc051ce6b32518bac0f77b1ce5e11

When getting number of signatures, count on indexed column

When getting number of signatures, count on the indexed column pt_id,
rather than doing COUNT(*)

Bug: 65850
Change-Id: Ifa1354545cba6c98cd5976812dc6c837d22ec571