{devel/py-easyprocess,x11/py-pyvirtualdisplay}: really chase renaming from devel/py-cog to devel/py-cogapp

This is a follow-up to my previous attempt (7e4175500e3f) to chase a
port renaming. In the previous commit, I only changed the package name
and forgot to change the origin. This commit should fix it.

Reported by: David Wolfskill <david@catwhisker.org> (via private email)
Fixes: 7e4175500e3f ({devel/py-easyprocess,x11/py-pyvirtualdisplay}: chase renaming from devel/py-cog to devel/py-cogapp)