Remove unused CAMEL_MESSAGE_HIDDEN flag.
Remove unused CAMEL_MESSAGE_HIDDEN flag.

tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server