Fix rename q_exc to n_exc (from quantum to neutron)

The patch fixes one file where q_exc was not renamed to n_exc during
the quantum to neutron rename.

Fixes bug: 1226162

Change-Id: I77625324b378bbe0e1461e5fea77c9747ca33624
Merge "Fix rename q_exc to n_exc (from quantum to neutron)"