Delete scheduled task when schedule is managed externally

src/main/java/name/nathanmcrae/numbersstation/WindowsScheduler.java

@@ -286,6 +286,10 @@ public class WindowsScheduler {
                 }
             }
 
+            if (settings.getManageScheduleExternally()) {
+                return Results.success(true);
+            }
+
             Result<String, String> userIdResult = getUserId();
             if (!userIdResult.hasSuccess()) {
                 return Results.failure(userIdResult.getFailure().get());