less dumb error for smc/sfc mismatch

[trillllian]

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saying "your rom title looks like garbage. is that correct? saying no improperly will crash your rom" is absurdly unhelpful when the correct message is "i am pedantic about file extensions, rename your rom to .sfc/.smc to match what's in the file"

(i've got nothing against it being pedantic about it for the record, just that message)