Fix issues around upgrading (#173)

* Re-check after

* Completion

* Relaunch

Secretive/Views/SetupView.swift

@@ -157,7 +157,7 @@ struct SecretAgentSetupView: View {
     }
 
     func install() {
-        _ = LaunchAgentController().install()
+        LaunchAgentController().install()
         buttonAction()
     }