tests/io/loadImage fails because http redirects to https (301 moved)

[dimitre]

should we keep just the https test?

curl -I http://openframeworks.cc/about/0.jpg

HTTP/1.1 301 Moved Permanently
Server: nginx/1.10.3
Date: Thu, 12 May 2022 04:02:33 GMT
Content-Type: text/html
Content-Length: 185
Connection: keep-alive
Location: https://openframeworks.cc/about/0.jpg