Blender Development Fund OGP image setting is not SSL

[tktk]

As the title says, the OGP image setting at https://fund.blender.org/ is http. Please fixes this to https. If I paste a link card in my blog, I will get a security warning for my browser.

Problem code is here.

[brecht]

@pablovazquez, I think this is your area?

[pablovazquez]

I’ve reported the bug in the tracker (Mike is handling these websites now).