Ops filter gauss does not respect the image dimensions

This issue is related to https://forum.image.sc/t/ops-filter-gauss-gives-a-wrong-output/39379

The gaussian filter ops does not process the dimensions properly.
The command ops.filter().gauss(dataset1, [1.0, 1.0, 0.0, 0.0, 0.0]) that should filter a XYZCT image only in XY gives a wrong result.

Start by reproducing the reported ops.filter().gauss(dataset1, [1.0, 1.0, 0.0, 0.0, 0.0]) case for an XYZCT image and compare it with the forum report. Trace the Gaussian filter's dimension handling; done means filtering affects only X and Y while preserving the expected Z, C, and T dimensions.

Written by the indexing model from the issue text.