[omnipay] fix undefined offset 1 error. set holder name as first name always.
[omnipay] fix undefined offset 1 error. set holder name as first name always.

ASKozienko/Payum,aitboudad/Payum,StoreFactory/Payum,staabm/Payum,Payum/Payum,Payum/Payum,fullpipe/Payum,formapro-forks/Payum,StoreFactory/Payum,StoreFactory/Payum,formapro-forks/Payum,fullpipe/Payum