Display the correct number of sections on course cards in the instructor page
Expected Behavior
The course cards on instructor pages should display the number of sections that professor is teaching.
Actual Behavior
The course cards display the total number of sections for that course in general.
In this image, see "29 sections" instead of "2 sections":

Tips
This is the line that needs to be changed https://git.gmu.edu/srct/schedules/blob/master/schedules/app/views/shared/_course.html.erb#L27
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