Fix status command exit code for running services (fixes #1110)

Previously, the `status` command returned exit code 1 for a service
in the `Running` state. This caused scripts and monitoring tools to
treat a healthy service as an error.

Updated the status logic to return exit code 0 for both `Stopped` and
`Running` states, and 1 for all other states.

Fixes #1110.

src/WinSW/Program.cs

@@ -786,6 +786,7 @@ namespace WinSW
                     context.ExitCode = svc.Status switch
                     {
                         ServiceControllerStatus.Stopped => 0,
+                        ServiceControllerStatus.Running => 0,
                         _ => 1
                     };
                 }