In case an appeal shall have been taken from a decree granting letters testamentary, or of administration with the will annexed, or of administration, or of guardianship, any order or decree of the probate court made previous to discontinuance of the appeal, prescribing the amount and nature of bonds to be given by the executor, administrator, or guardian, may, after discontinuance, be modified or vacated, and new orders and decrees may be substituted if necessary, and bonds given accordingly; and in case of the modification or vacation of any such former orders or decrees, the bond or bonds given thereunder may be cancelled and discharged by the probate court.