Conv3d test fix

[ffuuugor]

Conv3d grad sample test is failing currently: CircleCI

This is most likely due to a difference in unfold3d method between opacus and EW implementations.

Opacus:

if dilation != (1, 1, 1):
    tensor = filter_dilated_rows(tensor, dilation, dilated_kernel_size, kernel_size)

EW:

if dilation != (1, 1, 1):
    raise NotImplementedError(f"dilation={dilation} not supported.")

As dilation other than 1 is not supported under any conditions with EW, I've fixed thenis_ew_compatible flag.

PS: @ashkan-software do we have a github issue to update EW's unfold3d with the recent updates you made?

[alexandresablayrolles]

LGTM

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