Pressing Ctrl+C should cause an exit code >0

[DeflateAwning]

Pressing Ctrl+C to interrupt the progress bar should cause it to exit with a failure-indicating error code. Currently, it exits with error code 0.

The problem is if you use it in an infinite while true bash loop, pressing Ctrl+C should just kill the loop, but instead it continues onto the next command because it's still waiting.

Thanks for making this tool! I love its inline mode as a drop-in replacement for sleep.