fix(plesk): use subscription --unsuspend for unsuspend action

Reviewed-on: http://gitea.lan:3000/robbond/pleskSaas/pulls/18

lib/plesk/client.ts

@@ -289,7 +289,7 @@ export async function unsuspendPleskSubscription(
   subscriptionName: string,
 ) {
   return pleskCliCall(connection, "subscription", [
-    "--webspace-on",
+    "--unsuspend",
     subscriptionName,
   ]);
 }