Properly detect unexpected arguments

Signed-off-by: Kenny Meador <kenny.meador@outlook.com>

cmd/flux/uninstall.go

@@ -30,6 +30,7 @@ import (
 
 var uninstallCmd = &cobra.Command{
 	Use:   "uninstall",
+	Args:  cobra.NoArgs,
 	Short: "Uninstall Flux and its custom resource definitions",
 	Long:  `The uninstall command removes the Flux components and the toolkit.fluxcd.io resources from the cluster.`,
 	Example: `  # Uninstall Flux components, its custom resources and namespace