[Media TTT] Show icon on top of taskbar

This issue occurs on tablet, change the type of window layout param to
system error which is higher than navigation bar makes the icon
appears on top of the taskbar.

Fixes: 240550807
Test: Checked that the icon shows on top of the taskbar using adb
commands.

Change-Id: I455cd6202f0638cc196a6e690bb1806dba916f10

packages/SystemUI/src/com/android/systemui/temporarydisplay/TemporaryViewDisplayController.kt

@@ -17,7 +17,6 @@
 package com.android.systemui.temporarydisplay
 
 import android.annotation.LayoutRes
-import android.annotation.SuppressLint
 import android.content.Context
 import android.graphics.PixelFormat
 import android.graphics.Rect
@@ -67,11 +66,10 @@ abstract class TemporaryViewDisplayController<T : TemporaryViewInfo, U : Tempora
      * Window layout params that will be used as a starting point for the [windowLayoutParams] of
      * all subclasses.
      */
-    @SuppressLint("WrongConstant") // We're allowed to use TYPE_VOLUME_OVERLAY
     internal val commonWindowLayoutParams = WindowManager.LayoutParams().apply {
         width = WindowManager.LayoutParams.WRAP_CONTENT
         height = WindowManager.LayoutParams.WRAP_CONTENT
-        type = WindowManager.LayoutParams.TYPE_VOLUME_OVERLAY
+        type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR
         flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or
             WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
         title = windowTitle