add machine linking button to sandbox panel. (#2484)
add machine linking button to sandbox panel. (#2484)

* add machine linking button to sandbox panel.

* Update Content.Client/Sandbox/SandboxManager.cs

Co-authored-by: Paul Ritter <4a1a203ad1e9200b11a4f0b9ac509a92b9403efe@googlemail.com>

Co-authored-by: metalgearsloth <27cc5532143359f4f0a07538959588b08ac8861f@users.noreply.github.com>
Co-authored-by: Paul Ritter <4a1a203ad1e9200b11a4f0b9ac509a92b9403efe@googlemail.com>
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