fix CS sorting by rating

docs/changelog/7.x.x.txt

@@ -17,6 +17,7 @@
  - fix: Data Form tab delimited export doesn't obey field order
  - fix: Extra <a> tags inserted when viewing only Wiki page
  - fix: incorrect links generated for Event related links
+ - fix: Sort Collaboration System threads correctly by rating
 
 7.4.6
  - Prevent Help index from trying to link to non-existant documentation

lib/WebGUI/Asset/Wobject/Collaboration.pm

@@ -938,6 +938,10 @@ sub getThreadsPaginator {
 	}
 	$sortBy ||= "dateUpdated";
 	$sortOrder ||= "desc";
+    # Sort by the thread rating instead of the post rating.  other places don't care about threads.
+    if ($sortBy eq 'rating') {
+        $sortBy = 'threadRating';
+    } 
 
 	my $sql = "
 		select