fix: exit 0 when gracefully shutting down (#5555)

main.go

@@ -4,11 +4,10 @@ import (
 	"os"
 
 	"github.com/filebrowser/filebrowser/v2/cmd"
-	"github.com/filebrowser/filebrowser/v2/errors"
 )
 
 func main() {
 	if err := cmd.Execute(); err != nil {
-		os.Exit(errors.GetExitCode(err))
+		os.Exit(1)
 	}
 }