ReaxFF-lg scaling factor d

Dear LAMMPS developers,

I have noticed that although the radius scaling parameter d for
ReaxFF-lg was assigned to one of the unused items in the FF file
(index 35), it is not actually applied in the code to scale the radii.
The attached diff should fix, with the comment for clarity optional,
of course.

Best regards,

reaxc_ffield.cpp.diff (187 Bytes)