Remove ADAPTIVE_ICON_WINDOW_ANIM feature flag.

Has been enabled for past few releases, no longer needed
as a debug flag.

Bug: 209856611
Test: manual
Change-Id: Id25e36522636e5c5d8ee60cdec49b3ee3f4d4251

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -386,8 +386,7 @@ public abstract class BaseQuickstepLauncher extends Launcher
 
     @Override
     public boolean supportsAdaptiveIconAnimation(View clickedView) {
-        return mAppTransitionManager.hasControlRemoteAppTransitionPermission()
-                && FeatureFlags.ADAPTIVE_ICON_WINDOW_ANIM.get();
+        return mAppTransitionManager.hasControlRemoteAppTransitionPermission();
     }
 
     @Override