E1936: Fixed issue with Topics tab refreshing when any tab is switched to
E1936: Fixed issue with Topics tab refreshing when any tab is switched to

- This was causing an issue when switching to the Rubrics tab and unchecking the 'vary by topics' checkbox
  and then immediately switching to the Topics tab, causing the dropdown menus to still be displayed
  because the refresh was still happening for the Rubrics tab switch

- Updated the ajax success callback funciton to only refresh the Topics tab if the user
  is switching to the Topics tab, otherwise, the refresh is unnecessary.

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