Tweak Tor circuit display panel for screen readers
Two issues with the panel:
- The initial focus ends up on the wrapping
role="dialog"rather than therole="document". This means that NVDA will not announce the panel content when it is opened. - The spare
#tor-circuit-new-circuit-descriptionxul:labelwithin thexul:toolbarbuttonconfuses Orca, and Orca ends up reading this description aloud as if it is the only dialog content.