fix: add restart_again flag to DesiredStatus::Restarting

When a restart is requested while the service is already restarting
(stopped but not yet started), set restart_again so the actor will
perform another stop→start cycle after the current one completes.

sdk/base/lib/osBindings/DesiredStatus.ts

@@ -3,6 +3,6 @@ import type { StartStop } from './StartStop'
 
 export type DesiredStatus =
   | { main: 'stopped' }
-  | { main: 'restarting' }
+  | { main: 'restarting'; restartAgain: boolean }
   | { main: 'running' }
   | { main: 'backing-up'; onComplete: StartStop }