No you will not have to repay the money
Reference: AR 27-10 paragraph 3-21d
AR 27-10 extract:
Vacated suspended reduction – A suspended reduction, later vacated, is effective on the date the vacation is directed.
When a rank is taken as result of a vacated suspension you do not have to repay the money you received at the higher rank during the suspension period. The date the pay stops is the date the rank was taken.