Don't rebuild overlays on overlay commands automatically

internal/app/wwctl/overlay/create/root.go

@@ -12,11 +12,9 @@ var (
 		RunE:  CobraRunE,
 		Args:  cobra.ExactArgs(2),
 	}
-	NoOverlayUpdate bool
 )
 
 func init() {
-	baseCmd.PersistentFlags().BoolVarP(&NoOverlayUpdate, "noupdate", "n", false, "Don't update overlays")
 }
 
 // GetRootCommand returns the root cobra.Command for the application.