Update Go recents visibility based off adapter

View visibility should be based off adapter since that's what the layout
items are based off of.

Bug: 130440957
Test: Loading UI is shown when going to recents Go
Change-Id: I1f167553b6fdce757865c739b9793b63a20e7f57
(cherry picked from commit f1a47a0fe6)

go/quickstep/src/com/android/quickstep/views/IconRecentsView.java

@@ -334,7 +334,7 @@ public final class IconRecentsView extends FrameLayout {
      * of tasks.
      */
     private void updateContentViewVisibility() {
-        int taskListSize = mTaskLoader.getCurrentTaskList().size();
+        int taskListSize = mTaskAdapter.getItemCount();
         if (mEmptyView.getVisibility() != VISIBLE && taskListSize == 0) {
             crossfadeViews(mEmptyView, mContentView);
             mActivityHelper.leaveRecents();