fix(install): correct next page after installation completion

Change the next page reference from outputServerCredentialsPage to
attestationOptInPage so the user is taken to the attestation opt-in
screen instead of the server credentials page after finishing the
installation.

Author: mattevans

cmd/cli/commands/install/page_60_finished.go

@@ -22,7 +22,7 @@ func NewFinishedPage(display *InstallDisplay) *FinishedPage {
 
 	finishedPage.initPage()
 	finishedPage.page = tui.NewPage(
-		display.outputServerCredentialsPage.GetPage(),
+		display.attestationOptInPage.GetPage(),
 		"install-finished",
 		"Installation Complete",
 		"Contributoor has been configured successfully",