Stored SLM phase includes phase_correction

[ichristen]

The phase attribute of the SLM is overwritten every time slm.write() is used. When phase_correct=True (default), the phase_correction (if not None) is added to this. However, if the user stores the phase with stored = slm.phase.copy() and tries to slm.write(stored), the phase_correction will effectively be applied twice and might lead to unexpected results. Perhaps the sorted phase should not include the phase_correction?