Fix Jetpack icon name warning

[mokagio]

I don't have time at the moment to look into this minor issue, so I'm just parking it here.

@guarani if I recall correctly, you worked on the pride month icon rotation? If so, any ideas? Otherwise, apologies for the spam.

[guarani]

Thanks for flagging, @mokagio! I was involved, let me check in Xcode.

[guarani]

There are two AppIcon sets, one for Jetpack and another for WordPress. It looks like the one for WordPress was also added to the Jetpack target membership. I've unchecked it from there and will make a PR to test and submit the change.