Use hasBeenResumed() for checking if launcher is resumed

ag/23852178 introduced a clean up for launcher state when invoking
transient taskbar. It was checking launcher activity resumed state with
`isResumed()` method. This breaks transient taskbar for desktop mode as
we are marking the launcher activity to be paused using the launcher
flags. `hasBeenResumed()` method is the one we can used instead as it is
checking the launcher flags and not the resumed state of the activity
itself.

Bug: 292266259
Test: open transparent activity on top of launcher
      unstash taskbar
      go home
Test: move an app to desktop, unstash taskbar
Change-Id: I98d14dbfdde4b857f50e62206fc0f308e8f54231

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

@@ -204,7 +204,7 @@ public class TaskbarLauncherStateController {
                     updateStateForFlag(FLAG_LAUNCHER_IN_STATE_TRANSITION, false);
                     // TODO(b/279514548) Cleans up bad state that can occur when user interacts with
                     // taskbar on top of transparent activity.
-                    if (finalState == LauncherState.NORMAL && mLauncher.isResumed()) {
+                    if (finalState == LauncherState.NORMAL && mLauncher.hasBeenResumed()) {
                         updateStateForFlag(FLAG_RESUMED, true);
                     }
                     applyState();