Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I383341d6b05e8467fc6ff7e20e88c8dc0fd77cf3
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"