Discard needless test cases in `test_convolution_independent_gradients` (#15939)
Discard needless test cases in `test_convolution_independent_gradients` (#15939)

* Drop needless num_bases in test of conv

* Trigger CI

* Re-trigger CI

ForkedReposBak/mxnet,yajiedesign/mxnet,reminisce/mxnet,larroy/mxnet,sxjscience/mxnet,reminisce/mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,apache/incubator-mxnet,szha/mxnet,larroy/mxnet,leezu/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,sxjscience/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,tlby/mxnet,sxjscience/mxnet,tlby/mxnet,szha/mxnet,sxjscience/mxnet,szha/mxnet,larroy/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,szha/mxnet,tlby/mxnet,ForkedReposBak/mxnet,tlby/mxnet,reminisce/mxnet,tlby/mxnet,larroy/mxnet,zhreshold/mxnet,DickJC123/mxnet,yajiedesign/mxnet,larroy/mxnet,szha/mxnet,szha/mxnet,szha/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,larroy/mxnet,yajiedesign/mxnet,reminisce/mxnet,zhreshold/mxnet,leezu/mxnet,apache/incubator-mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,leezu/mxnet,yajiedesign/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,DickJC123/mxnet,leezu/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,reminisce/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,tlby/mxnet,ForkedReposBak/mxnet,leezu/mxnet,zhreshold/mxnet,tlby/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,tlby/mxnet,zhreshold/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,leezu/mxnet,reminisce/mxnet,larroy/mxnet,leezu/mxnet,yajiedesign/mxnet,sxjscience/mxnet,zhreshold/mxnet,szha/mxnet,larroy/mxnet,reminisce/mxnet,apache/incubator-mxnet,larroy/mxnet,szha/mxnet,leezu/mxnet,reminisce/mxnet,tlby/mxnet,tlby/mxnet,yajiedesign/mxnet,leezu/mxnet,ForkedReposBak/mxnet