Workers’ compensation — Attendant care — Evidence — Judge of compensation claims erroneously accorded presumption of correctness to expert medical advisor’s opinion with regard to claimant’s need for attendant care where evidence did not demonstrate sufficient disagreement in the opinions of health care providers as to whether attendant care benefits were medically necessary at time of hearing or whether any need for attendant care was caused by compensable accident — JCC should have considered EMA’s testimony without presumption of correctness ordinarily granted to EMA opinions