Remove descriptor buffer property check that wasn't needed

[gary-sweet]

Description

The descriptor buffer sample was checking the combinedImageSamplerDescriptorSingleArray property and would error out if it wasn't set, claiming that the sample wouldn't run if it was false.

Broadcom's driver sets that property to false as we require that arrays of combined image samplers be separated, images first followed by samplers. I had originally modified the sample to do just that if the property was false, but that didn't work. The sample isn't actually using an array of combined-image-samplers, it just writes two separate ones back-to-back in the buffer, so works fine regardless of the combinedImageSamplerDescriptorSingleArray value right now.

I've removed the check, and added some commentary about what would need to be done for an actual array.

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[SaschaWillems]

Good catch. Thanks for change 👍🏻