Prefer launching desktop tasks on freeform display

Update usages of TaskbarActivityContext.inDesktopMode to account for a
possibility of a desktop flavour taskbar (i.e. pinned taskbar that
shows desktop tasks) being shown outside desktop mode, which may be the
case on freeform displays (e.g. when
enable_desktop_taskbar_on_freeform_displays feature is enabled, or on
home). Tasks launched from this taskbar should preferably be launched
into desktop mode.

Bug: 390665752
Flag: com.android.window.flags.enable_desktop_taskbar_on_freeform_displays
Test: manual on desktop device. verify correct taskbar is shown
      on home screen, in overview, in desktop mode, with fullscreen
      app shown. Verify opening/launching apps from taskbar works
      as expected.

Change-Id: I8f198216d84fd165c2dcbf437c82e418e5c7405e

quickstep/src/com/android/launcher3/taskbar/TaskbarViewController.java

@@ -748,8 +748,9 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
     }
 
     private boolean shouldUpdateIconContentDescription(BubbleTextView btv) {
-        boolean isInDesktopMode = mControllers.taskbarDesktopModeController.isInDesktopMode(
-                DEFAULT_DISPLAY);
+        boolean isInDesktopMode =
+                mControllers.taskbarDesktopModeController.shouldShowDesktopTasksInTaskbar(
+                        DEFAULT_DISPLAY);
         boolean isAllAppsButton = btv instanceof TaskbarAllAppsButtonContainer;
         boolean isDividerButton = btv instanceof TaskbarDividerContainer;
         return isInDesktopMode && !isAllAppsButton && !isDividerButton;