Change %c to %lc for wchar arguments.
swprintf_s expected an argument of type char (due to %c). Given an argument of type wchar.
This fixes N7 and N8 from #5288
Refs #5288
Patch By: @animus
Accepted By: @phosit, @vladislavbelov
Differential Revision: https://code.wildfiregames.com/D4993