TicketCipher -> TicketCipherT in FizzConfigUtil
TicketCipher -> TicketCipherT in FizzConfigUtil

Summary:
I just want to make it clear that TicketCipher is a template param in
this context, not the abstract type TicketCipher. I did this earlier for
FizzUtil, but I forgot to change it here as well.

Reviewed By: ngoyal

Differential Revision: D19510607

fbshipit-source-id: 839b564816cc4b70105f9bde0bd56823a430f678

facebook/wangle,facebook/wangle,facebook/wangle