Some Fi1r-only sessions have demodulated commanded voltages after all

[pauladkisson]

During my thorough inspection of example sessions, I discovered that, for some sessions, Fi1r is a 6xN array representing:
dms_signal
dms_control
dls_signal
dls_control
modulated_dms
modulated_dls

rather than a 2xN array representing
modulated_dms
modulated_dls

as I had encountered before.

So, these sessions will need to be identified and fiberphotometryinterface adjusted accordingly.