Fix unsigned comparison check in const pad kernel

[JakeStevens]

Summary:
The logic is:

size_t pad_i = ndim - 1 - i;
if (pad_i >= 0 pad_i < pad.size() / 2)

the loop range is irange(ndim)

so the min val is when we are at the end of the iterator

ndim - 1 - i

is

ndim - 1 - (ndim - 1)

= 0

pad_i >= 0 check is redundant

Differential Revision: D96926279

[pytorch-bot]

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