bento: Update bento desk buttons visibility correctly

Update the buttons visibility while initializing the desks bar,
regardless of the desk bar's state.

Bug: 1167362
Change-Id: I8f4578300ff4259bcba14a4f175c55ed062ccb03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2635442Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845186}

ash/wm/desks/desks_bar_view.cc

@@ -691,8 +691,9 @@ void DesksBarView::UpdateNewMiniViews(bool initializing_bar_view,
   const bool is_bento_enabled = features::IsBentoEnabled();
   const auto& desks = DesksController::Get()->desks();
   if (is_bento_enabled) {
-    if (IsZeroState() && !expanding_bar_view) {
+    if (initializing_bar_view)
       UpdateBentoDeskButtonsVisibility();
+    if (IsZeroState() && !expanding_bar_view) {
       gfx::Transform transform;
       transform.Translate(0, -(height() - kZeroStateBarHeight));
       background_view_->layer()->SetTransform(transform);