Bugfix for comparison to zero with torch tensor

[lillian542]

Context:
ctrl_decomp_zyz with a target with torch parameters fails because qml.math.isclose(torch.Tensor, float) raises a TypeError. From forum post here.

Description of the Change:
Switching to qml.math.isclose(float, torch.Tensor) seems to appease PyTorch.

Related GitHub Issues:
#5185

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c1a813d) 99.68% compared to head (4939bc5) 99.67%.
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5183      +/-   ##
==========================================
- Coverage   99.68%   99.67%   -0.01%     
==========================================
  Files         394      394              
  Lines       36160    36051     -109     
==========================================
- Hits        36047    35935     -112     
- Misses        113      116       +3     

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[lillian542]

[sc-56462]

[mudit2812]

What a weird reason to raise an error.