Improve tty_putp error message
Improve tty_putp error message

When tty_putp fails the following message is outputted:

  pick: tputs: Success

Since tputs does not set errno this message is confusing. Instead output
the name of the missing capability:

  pick: enter_ca_mode: unknown terminfo capability

Notice that enter_ca_mode is just an example and will be substituted with
the capability that caused the failure during execution.

thoughtbot/pick,thoughtbot/pick,calleerlandsson/pick,thoughtbot/pick,prahlad37/pick,DBOTW/pick,prahlad37/pick,prahlad37/pick,DBOTW/pick,calleerlandsson/pick,prahlad37/pick,thoughtbot/pick,calleerlandsson/pick,DBOTW/pick