C4 lin 182 track rating 4.3 reopen

<b>For scenario reviewers :- </b> 
1) Sign in as email = "1@lecturer.com" or "1@ta.com" , password = "123456789"
2) Navigate to Courses and then click on topic1 (route : /topics/1)
3) Click on "Edit Track Rating" button and drag and drop the tracks to change their difficulty rating.
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#182 @rami-khalil @mimikian @Sharaf93 @fadel1493 @mohamedsaeed93