Confocal excitation PSF uses emission wavelength #148

_PSFModality._summed_weighted_psf calls self.psf(..., em_wvl_nm=...) without ex_wvl_nm (_simple_psf.py), so make_psf falls back to ex_wvl_nm = em_wvl_nm (psf.py). The confocal excitation PSF is therefore computed at the emission wavelength (slightly too large). The modality would need the channel's excitation wavelength (e.g. from the OpticalConfig light source).

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