Fix input_channels divisibility check in concat_split_op (#31448)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31448
Replace `(!x%y)` with `(x%y != 0)`
Test Plan: CI
Reviewed By: orionr
Differential Revision: D19165492
fbshipit-source-id: 246635fb8ddd5823196bcef9d0e6cdf1c349015e
