Edit arguments given to run new upgraded subctl

os.Args[1:] dropped prefix `subctl` so when upgrade is run using
upgraded subctl, `upgrade` is considered as the new parent command and
hencce complains about the `--to-version` validity.

This PR drops the arg slicing.

Closes: #962

Signed-off-by: Janki Chhatbar <[email protected]>

cmd/subctl/upgrade.go

@@ -80,7 +80,7 @@ func upgrade(_ *cobra.Command, _ []string) {
 		// Step 2a: subctl was upgraded, so run it instead of continuing
 		cmd := exec.Cmd{
 			Path:   command,
-			Args:   os.Args[1:],
+			Args:   os.Args,
 			Stdin:  os.Stdin,
 			Stdout: os.Stdout,
 			Stderr: os.Stderr,