[ONNX] Fix eye export

[BowenBao]

Previously did not considered the case were optional m is not provided in torch.eye(n, m).

[codecov]

Codecov Report

Merging #47016 into master will decrease coverage by 0.00%.
The diff coverage is 7.69%.

@@            Coverage Diff             @@
##           master   #47016      +/-   ##
==========================================
- Coverage   68.94%   68.93%   -0.01%     
==========================================
  Files         434      434              
  Lines       56188    56197       +9     
==========================================
+ Hits        38740    38741       +1     
- Misses      17448    17456       +8     

[dr-ci]

💊 CI failures summary and remediations

As of commit 8cb630f (more details on the Dr. CI page):

---

• 1/1 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)

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codecov.io: 1 failed

• Failed: codecov/patch

---

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[neginraoof]

LGMT. Thanks!

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[facebook-github-bot]

@bzinodev merged this pull request in 0fb1356.