handle_inter_mode: rename opt_args to args

The addition of a 2D array to the HandleInterModeArgs struct means there
is now a non-optional member in the opt_args struct passed to
handle_inter_mode and its child functions. Since opt_args no longer
consists solely of optional members I've renamed it args.

Change-Id: I7f3b22188777d8fdac2c244746638c34b5d8636c
1 file changed