virtual_z phases

[DavidSarlle]

Seems that virtual_z_phases (probabilities) has an error in the routine and the virtual_z defined in te experiment is not applied. The same routine with signal works as expected. The problm is in line 249.
It should be:
theta - data.vphases[ord_pair][target_q]

instead of:
theta

[Edoardo-Pedicillo]

This issue is solved by #1017, which has already been merged into main. Could you please test it again with the main branch and show that everything is working as expected?