Minor typo fix so TGAImageCodec is selected properly in the case where no other codec is available.
Minor typo fix so TGAImageCodec is selected properly in the case where
no other codec is available.

ruleless/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI