Revert "Push wallpapers on the back during transitions"

This reverts commit 7bc428e7762f59e521ae4e8c8365cba02e7ff82b.

Reason for revert: Should be unneeded after wallpaper change reported correctly.

Change-Id: I669837c4368b83412bd06d174980406aa993d9ab
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/transition/Transitions.java b/libs/WindowManager/Shell/src/com/android/wm/shell/transition/Transitions.java
index 3e6ac95..ec6802d 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/transition/Transitions.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/transition/Transitions.java
@@ -76,7 +76,6 @@
 import com.android.internal.R;
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.protolog.ProtoLog;
-import com.android.window.flags.Flags;
 import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.common.DisplayController;
@@ -586,14 +585,6 @@
         final boolean isOpening = isOpeningType(transitType);
         final boolean isClosing = isClosingType(transitType);
         final int mode = change.getMode();
-        // Ensure wallpapers stay in the back
-        if (change.hasFlags(FLAG_IS_WALLPAPER) && Flags.ensureWallpaperInTransitions()) {
-            if (mode == TRANSIT_OPEN || mode == TRANSIT_TO_FRONT) {
-                return -zSplitLine + numChanges - i;
-            } else {
-                return -zSplitLine - i;
-            }
-        }
         // Put all the OPEN/SHOW on top
         if (mode == TRANSIT_OPEN || mode == TRANSIT_TO_FRONT) {
             if (isOpening) {