Override editor course title on import only when repository entry title was changed

If importing a former exported course, the course title from the course info page will be set also at the editors title, although the editors title was different.

There are many cases where the editor course title should not be modified. However, when the user during import modifies the title the expectation is that this change is reflected in the course. It is odd that the course editor title does still have the old title. 

The new solution is as follows: 

• keep the course editor title when the user does not change the repository entry title during import
• change the course editor title when the user does change the repository entry title during import