Decrease values in WebGL tests to fit into WebGL1's range (#6372)
Decrease values in WebGL tests to fit into WebGL1's range (#6372)

* decrease values in tests

* Update Conv2D_impl_test.ts

tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs,tensorflow/tfjs