Headland: Fix shadow RAM enable#6785
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Summary
Fix shadow RAM enable on the Headland chipsets (correct a switch statement to only check bits 4-3 of CR0).
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References
Provide links to datasheets or other documentation that helped you implement this pull request.
Headland HT18 datasheet: https://theretroweb.com/chip/documentation/ht18a-b-c-64512ff1a6398435658181.pdf