Update default desktop app density to 284

Set desktop density to 284 by default. It can still be overridden with
the system property.
Setting the system prorperty to 0, disables the override.

Bug: 287126023
Test: move an app to desktop, observe the density changes
Change-Id: Iff2464d5c6a16cca6b6e8ed444bdb2beb69c3fab
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt b/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt
index d016e73c..7463ce2 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt
@@ -926,7 +926,7 @@
 
     companion object {
         private val DESKTOP_DENSITY_OVERRIDE =
-            SystemProperties.getInt("persist.wm.debug.desktop_mode_density", 0)
+            SystemProperties.getInt("persist.wm.debug.desktop_mode_density", 284)
         private val DESKTOP_DENSITY_ALLOWED_RANGE = (100..1000)
 
         // Override default freeform task width when desktop mode is enabled. In dips.