Fix case of SpecialAllPages/SpecialAllMessages in SpecialPageFactory

[autoloader] Class SpecialAllpages was loaded using incorrect case
[autoloader] Class SpecialAllmessages was loaded using incorrect case

Follow-Up: Ic137bc7adbc4a9ed96448ba0fee4807b67b3112d
Follow-Up: I21a164af0b6ec123bf654cd1e4e7085b1192f067
Change-Id: Idae65141de0de41bf4244408218a91c4b87d5b7d