[zend-progressbar] fix "stty: 'standard input': Inappropriate ioctl for device" spam

[falkenhawk]

using zend-progressbar with Console adapter spams stty: 'standard input': Inappropriate ioctl for device on non-interactive shell (e.g. tests on CI)

Never fixed in original zf v2 / laminas:
zendframework/zend-progressbar#23
laminas/laminas-progressbar#2

[partikus]

An interesting approach with redirecting stderr to /dev/null. 👍

[falkenhawk]

@marcinlee suggested that [[ $- == *i* ]] && stty size could be used instead - to avoid calling stty at all when shell is not interactive. Might be cleaner than to discarding stderr. 🤔

[partikus]

@falkenhawk both are fine, IMHO discarding stderr is easier to understand though the condition looks like a more appropriate approach