Street Fighter Alpha 2 EX (Enhanced version)

found a bug here affecting all versions, regulation setting is not honored in training mode and produces white blood only

**Symptom* In Training mode, blood stayed white with Regulation OFF on both Darksoft CPS2 and MiSTer. Arcade and Versus behaved correctly.

**Fix* A **one-bit change** to Training’s palette-reservation mask prevents the input display from overwriting the shared blood palette.
 
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