Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I771f42d23b0df4aaf77d0ec0d842d24cdad7ebb7
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"