Insurance — Homeowners — Exclusions — Constant or repeated seepage or leakage of water over a long period of time — Jury instructions — Trial court erroneously instructed jury about the duty to adjust claim, which transformed case into a referendum on the quality of the adjuster’s performance instead of focusing the jury on the factual issue of whether the loss fell under the policy exclusion — Trial court also erred in instructing jury on how to construe insurance contract, as construction of insurance policy is question of law for court