$EF88/61320:   Set flag for BAM changed

Jump from $EF6C, $EF9F:

EF88: A6 7F     LDX $7F         ; drive number
EF8A: A9 01     LDA #$01
EF8C: 9D 51 02  STA $0251,X     ; flag = 1
EF8F: 60        RTS

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