fix(x-pixel): correct variable name from e.exe to s.exe

[tsukiyama-3]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR fixes a typo in src/runtime/registry/x-pixel.ts where
if (e.exe) should be if (s.exe).

This bug was introduced in 3c46cff

This typo caused the following console error:

Due to this typo, the initialization function never executed properly.
As a result, tracking events could not be sent.

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commit: e7cd806