fix: Consider app transfer as a valid command

[valentin-consulting]

App ownership transfer from CLI always shows help, rather than doing action. It seems command is never marked as valid.

[lucen-ms]

@valentin-consulting have you actually tested the ownership transfer? Does it work correctly please?

[valentin-consulting]

@lucen-ms , yes, i tested it.

• Without this single line, npx code-push-standalone app transfer [app] [email] always shows help.
• With this line, it prompts for confirmation, checks permission and registers the transfer. Then, I have to switch account to transfer the app back to me => For me, transfer is ok

[lucen-ms]

Thank you @valentin-consulting !