Adjust calculated height of description cell

The height calculation for the description cell did not previously take into account the table's separator insets, which may be adjusted for things like section index titles.

Classes/ObjectExplorers/FLEXObjectExplorerViewController.m

@@ -347,7 +347,7 @@
         
         return [FLEXMultilineTableViewCell
             preferredHeightWithAttributedText:attributedText
-            maxWidth:tableView.frame.size.width
+            maxWidth:tableView.frame.size.width - tableView.separatorInset.right
             style:tableView.style
             showsAccessory:NO
         ];