[vulkan][test] Not use non 1 dilation for conv2d (#48800)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48800
Test Plan: Imported from OSS
Reviewed By: SS-JIA
Differential Revision: D25312276
Pulled By: IvanKobzarev
fbshipit-source-id: edb36c284ddb79969cbc4e774f11d85f14b39343
