Modality pixelsize_nm must be divisible by psf_voxel_nm

[tshakespeare]

Describe the bug
When changing modality parameters in vLab4Mic main notebook using myexperiment.update_modality(), the pixel size must be a value that is divisible by the psf voxel size, otherwise the acquisition preview does not load. Changing the psf voxel size to 1 does overcome this, but it takes too long to load even the acquisition preview to test this for full simulation.

To Reproduce
Steps to reproduce the behavior:

1. Run Jupyter notebook vLab4Mic-main
2. Load in structrue (e.g. 7R5K)
3. Load in probe (e.g. NPC_Nup96_Cterminal_direct with defaults)
4. Load in virtual sample paramters (e.g. 1 particle with no randomisation)
5. Edit confocal modality using line:
   my_experiment.update_modality("Confocal", 45, 170,340)
6. select confocal modality and update virtual microscope (toggle psf view should show: pixel size at 45 nm; lateral res at 170 nm; axial res at 340 nm; and depth of field at 1000 nm)
7. Select acquisition parameters: confocal; select all chanels
8. update acquisition parameters and select interactive acquisiont preview
9. See error:
   nothing shows up for the acquisition preview in this case.

Expected behavior
Expect to see a preview of the virtual sample with edited acquisition parameters at this stage.

Desktop (please complete the following information):

• OS: iOS
• Browser: Firefox
• Version: 145.0.2

Additional context
If you change the confocal modality voxel size parameter to a multiple of the pixel size, e.g. 15, replacing the code in step 5 with my_experiment.update_modality("Confocal", 45, 170,340,15), then a virtual sample preview will appear at step 9.