fixup! Bug 1823316 - Use 'Snackbar' themed Dialog to notify on making app full-screen

Fix tor-browser#42355 backporting regression.

fenix/app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -1491,6 +1491,7 @@ abstract class BaseBrowserFragment :
                 parentFragmentManager,
             )
 
+            activity?.enterToImmersiveMode()
             (view as? SwipeGestureLayout)?.isSwipeEnabled = false
             browserToolbarView.collapse()
             browserToolbarView.view.isVisible = false