§ 103. Repeal of resolution by board. Not less than twenty days prior to the election at which a resolution is to be voted upon by the electors of the county for approval or disapproval, the board of supervisors may, except as otherwise expressly provided in subdivision four of section one hundred one, reconsider its action thereon and repeal such resolution, whereupon the proposition for its approval shall not be submitted at such election, or, if submitted, the vote of the electors thereon shall be without effect.