Display drip schedule on single course page when lessons are in a module

[amroland]

It would be good to see on the course page exactly when each dripping lesson will be available.
This information is currently visible only when you enter each lesson.

I suggest like this:

[donnapep]

Note that this is only an issue when lessons are inside a module. When lessons are not in a module, the date on which the lesson will become available is displayed.