Fixed a wrong variable name

Session/Conversations/ConversationVC+Interaction.swift

@@ -2377,7 +2377,7 @@ extension ConversationVC {
         })
         alertVC.addAction(UIAlertAction(title: "TXT_CANCEL_TITLE".localized(), style: .cancel, handler: nil))
         
-        Modal.setupForIPadIfNeeded(sheet, targetView: self.view)
+        Modal.setupForIPadIfNeeded(alertVC, targetView: self.view)
         self.present(alertVC, animated: true, completion: nil)
     }