Removed device selection in "open" command

[nicorac]

There's no need to show a device selection in open command when there's only one device available.

Since there's only a single possible selection, blocking open command waiting for user answer is worthless 😉.

NOTE: the behavior added by this PR to ionic cli is already present in capacitor cli.

[nicorac]

Just rebased my patch, but workflow won't restart...🙄