fix use of showSliceControls

[will-moore]

Reminded of this fix when showing @pwalczysko the other day...

To test:

When chunks are 2D, we don't need to show the 'slice' controls, so it should look like this:

https://deploy-preview-30--ome-ngff-validator.netlify.app/?source=https://uk1s3.embassy.ebi.ac.uk/idr/zarr/v0.4/idr0062A/6001240.zarr

When chunks are 3D, then we show the 'slice controls':

https://deploy-preview-30--ome-ngff-validator.netlify.app/?source=https://minio-dev.openmicroscopy.org/idr/v0.4/idr0077/9836832_z_dtype_fix.zarr

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[joshmoore]

For me, the second one is raising an exception, @will-moore:

[will-moore]

Seems https://minio-dev.openmicroscopy.org/idr/v0.4/idr0077/9836832_z_dtype_fix.zarr/.zattrs is failing to load (it was working earlier)!

[will-moore]

@will-moore This url is working for me now if you want to give it another try? Thx