(docs) Remove VirusTotal from known proxy issues

The issue linked as a known proxy issue is not actually an issue. It was
created due to a misunderstanding of how the VirusTotal check was
working, and ultimately the VirusTotal check is using the proxy settings.

Author: corbob

src/content/docs/en-us/guides/usage/proxy-settings-for-chocolatey.mdx

@@ -24,7 +24,6 @@ Chocolatey applies proxy configuration based on the order below:
 Certain Chocolatey products are known to apply different proxy settings depending on circumstances.
 
 * Chocolatey GUI - [Downloading icons does not honor Chocolatey CLI proxy settings](https://github.com/chocolatey/ChocolateyGUI/issues/1013).
-* Chocolatey Licensed Extension - [VirusTotal checking at runtime does not use any proxy](https://github.com/chocolatey/chocolatey-licensed-issues/issues/351).
 * Chocolatey Agent - [Agent communications do not use any proxy configuration](https://github.com/chocolatey/chocolatey-licensed-issues/issues/350).
 
 ## Installing Chocolatey From Behind a Proxy Server