Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I5a8eea8edae9fe91611a3168ef4113685638d795
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"