Change signature of the setPbc(...) method in update-constraints

Change signature of the setPbc(...) method in update-constraints

The PBC description is stored in update-constrain module in the
PBCAiuc format, which only requires type of the PBC and the box
matrix for setup. Hence, constructing the t_pbc structure is
additional unnessesary step in the PBC reinitialization.

Change-Id: I9dff337fa18f22d9164168de37ba8fb8630ba713