Blank screen launching prompt tracer the 2nd time

[TylerLeonhardt]

In short, I'm doing the following:

• add the HTML Tracer
• render a prompt
• show the HTML
• dispose of that tracer
• render a new prompt with a new HTML Tracer
• show the HTML

The 2nd time I do this, I get a blank screen and:

[connor4312]

https://github.com/microsoft/vscode-prompt-tsx/pull/114