Fix: Sort Tracks without the dialog | Edit track rating - 4.3

<b>Original issue: #182</b>

The tracks now can be sorted without the need of of a dialog box. Just clock on the "Edit track rating" button and the list of tracks will be sortable. 

<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 course "Data Structures and Algorithms" then 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 @Sharaf93 @fadel1493 @mimikian @mohamedsaeed93