Remove Intent.ACSD from KEYCODE_SEARCH action in-app

Apps can't close system dialogs anymore due to abuse. If we branch to
launching the assistant, VoiceInteractionSession has the power to close
system dialogs (besides I suspect this code-path is unused).

Bug: 191131805
Test: In-app, adb shell input keycode KEYCODE_SEARCH, verify no crash
Change-Id: I2ef20e0a0d9f05c26747e4dfca5bdb6ec7bd1c1f

core/java/com/android/internal/policy/PhoneWindow.java

@@ -70,12 +70,12 @@ import android.transition.TransitionInflater;
 import android.transition.TransitionManager;
 import android.transition.TransitionSet;
 import android.util.AndroidRuntimeException;
-import android.view.AttachedSurfaceControl;
 import android.util.EventLog;
 import android.util.Log;
 import android.util.Pair;
 import android.util.SparseArray;
 import android.util.TypedValue;
+import android.view.AttachedSurfaceControl;
 import android.view.ContextThemeWrapper;
 import android.view.CrossWindowBlurListeners;
 import android.view.Gravity;
@@ -3148,7 +3148,6 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
         if (cb == null || isDestroyed()) {
             result = false;
         } else {
-            sendCloseSystemWindows("search");
             int deviceId = event.getDeviceId();
             SearchEvent searchEvent = null;
             if (deviceId != 0) {