Insurance — Uninsured motorist — Jurors — Peremptory challenge — Trial court erred in denying defendant insurer’s peremptory challenge of African-American female juror on ground that race-neutral explanation for challenge, that juror was inattentive and did not appear engaged in jury selection process, was legally insufficient — Where trial court agreed with defendant’s observation that juror was not particularly engaged, defendant was entitled to presumption that proffered reason for challenge was genuine, and court was obligated to undertake a genuineness analysis prior to disallowing the strike, which court did not do — New trial required