oobe: Unfreeze UI on the enrolled machine

Partially reverted CL:2002917

Fixed: 1047215
Change-Id: I4627b5753711abecc3443944aeb83d1c38c8f2f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030947Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736976}

ash/login/ui/lock_contents_view.cc

@@ -1209,6 +1209,7 @@ void LockContentsView::OnOobeDialogStateChanged(OobeDialogState state) {
 
   // Show either oobe dialog or lock screen.
   SetVisible(!oobe_dialog_visible_);
+  GetWidget()->widget_delegate()->SetCanActivate(!oobe_dialog_visible_);
 
   UpdateBottomStatusIndicatorVisibility();