Plugin: BuyCourse: Teacher subscribed to course should not see purchase button

[ywarnier]

Current behavior

The teacher can buy his/her own course

Expected behavior

The teacher should not see the "buy" button

Steps to reproduce

As a teacher, create a course.
As an admin, put the course on sale.
As a teacher, go to the catalogue, open the course page, click on buy.
Proceed to buying.

Chamilo Version

1.11.x 2018-06-13

[stale]

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