fix #796: Export SVG fix

[sidharthv96]

📑 Summary

Brief description about the content of your PR:

Add setAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');

Resolves #796

📏 Design Decisions

Describe the way your implementation works or what design decisions you made if applicable:

This is a temporary fix till the main issue is fixed in mermaid library.
Only few diagrams have this attribute added in mermaid. So SVGs of other diagrams will throw the error.

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added unit/e2e tests (if appropriate)
• 🔖 targeted master branch

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[cypress]

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Test summary

25 • 0 • 1 • 0

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Run details

Project	Mermaid Live Editor
Status	Passed
Commit	b9961a3 ℹ️
Started	Jun 28, 2022 6:59 PM
Ended	Jun 28, 2022 7:02 PM
Duration	03:40 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 100

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