MXCFB:  Unbreak Zelda/Rex (#1314)
MXCFB:  Unbreak Zelda/Rex (#1314)

* Fix a terrible typo in #1312 that used the wrong A2 constant on Zelda/Rex, causing the Reader to get squished to 2bit by FORCE_MONOCHROME. Ouch.
koreader/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,koreader/koreader-base