fix bug that opens bookmarks in same tab (#1495)

Task/Issue URL:
https://app.asana.com/0/1177771139624306/1205284729234368/f

**Description**: When clicking on a bookmark from the bookmarks bar, a
normal tap should open it in the current tab and CMD+CLICK should open
it in a new tab. This will reinstate this behaviour and at the same time
fix a behaviour when CMD+OPTION+NUMBER opened favorites on a new tab:
https://app.asana.com/0/1177771139624306/1204216091208991/f

Author: SabrinaTardio

DuckDuckGo/Windows/View/WindowControllersManager.swift

@@ -124,6 +124,8 @@ extension WindowControllersManager {
             WindowsManager.openNewWindow(with: url, isBurner: false)
         } else if mainWindowController?.mainViewController.view.window?.isPopUpWindow ?? false {
             show(url: url, newTab: true)
+        } else if NSApplication.shared.isCommandPressed && !NSApplication.shared.isOptionPressed {
+            mainWindowController?.mainViewController.tabCollectionViewModel.appendNewTab(with: .url(url), selected: false)
         } else if selectedTab?.isPinned ?? false { // When selecting a bookmark with a pinned tab active, always open the URL in a new tab
             show(url: url, newTab: true)
         } else {