[webgpu] Enable test for fusedConv2D

[axinging]

The setup_test for fusedConv2D is incorrect(https://github.com/tensorflow/tfjs/pull/2448/files#diff-b8ad73e5d7aa8806baa3909ff26ab879R185), it should be as follows:

  {
    include: 'fused conv2d',
    excludes: [ ]
  },

The original feature request is here: #2362

[axinging]

This issue is introduced by my previous PR(#2448), I will work on this soon.

[rthadur]

@axinging thank you for working on this , do you need any help from our team ?

[axinging]

@rthadur, thanks, I have a draft fix for this, will submit it soon.