Rename freeform tasks to desktop tasks

Bug: b/332878426
Test: refactoring CL. Existing unit tests still pass.
Flag: NONE

Change-Id: I24ad9699223dd383ff794ef3b028bf32beca96d7

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

@@ -115,7 +115,7 @@ public final class KeyboardQuickSwitchController implements
         DesktopVisibilityController desktopController =
                 LauncherActivityInterface.INSTANCE.getDesktopVisibilityController();
         final boolean onDesktop =
-                desktopController != null && desktopController.areFreeformTasksVisible();
+                desktopController != null && desktopController.areDesktopTasksVisible();
 
         if (mModel.isTaskListValid(mTaskListChangeId)) {
             // When we are opening the KQS with no focus override, check if the first task is