Fresh-install bug report fixes:
- Silent installs wrote server_url: '' -- CurPageChanged fires even when the
wizard is walked programmatically in silent mode, so it read the empty edit
boxes and clobbered the /SERVER_URL /JOIN_KEY command-line params. Guard the
read with WizardSilent() so silent installs keep the params and interactive
installs keep the wizard values. (This is also why the service exited on
first connect and the Directory showed the agent as 'v2.0.0': the agent never
connected, so the server fell back to its placeholder version.)
- The tray post-install launch had skipifsilent, so a silent install (the
common path from the Directory's Windows command) never started the tray.
Removed it -- the tray starts in silent installs too.
- theta-agent update (cli.go) downloaded from the SSO /resources path, which no
longer serves binaries (they are GitHub release artifacts now) -- 404.
Pointed it at releases/latest/download via releaseAssetURL.