Keep (add if not existing) xmlns attribute for generated SVG images (#23410)

Fix #23409 

Developers could browse & preview the local SVG images files directly.

It still has clear output.

![image](https://user-images.githubusercontent.com/2114189/224317107-f4b26c76-e36a-4e80-9eee-d8dc2e16421f.png)


![image](https://user-images.githubusercontent.com/2114189/224317527-2d4ca131-978c-4933-b071-4bae483f06e1.png)

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Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: delvh <leon@kske.dev>

public/img/svg/octicon-arrow-down-left.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-arrow-down-left" width="16" height="16" aria-hidden="true"><path d="M11.78 4.22a.75.75 0 0 1 0 1.06l-5.26 5.26h4.2a.75.75 0 0 1 0 1.5H4.71a.75.75 0 0 1-.75-.75V5.28a.75.75 0 0 1 1.5 0v4.2l5.26-5.26a.75.75 0 0 1 1.06 0Z"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" class="svg octicon-arrow-down-left" width="16" height="16" aria-hidden="true"><path d="M11.78 4.22a.75.75 0 0 1 0 1.06l-5.26 5.26h4.2a.75.75 0 0 1 0 1.5H4.71a.75.75 0 0 1-.75-.75V5.28a.75.75 0 0 1 1.5 0v4.2l5.26-5.26a.75.75 0 0 1 1.06 0Z"/></svg>