Remove unused sin_triton in triton tutorial

[thomasjpfan]

Description

sin_triton is not defined but not used in the tutorial. The tutorial uses mysin to launch the triton kernel for torch tensors.

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3281

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