Migrate desktop_form_factor to Launcher3

Bug: 391958794
Flag: com.android.launcher3.enable_scalability_for_desktop_experience
Test: Verified manually
Change-Id: I7002e04eaf980e5037a6d33935457cb2d26cf5cd
diff --git a/res/values/config.xml b/res/values/config.xml
index 1a2ac9e..4ea9e2c 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -225,4 +225,7 @@
          of the same name in SystemUI. -->
     <string-array name="config_appsSupportMultiInstancesSplit">
     </string-array>
+
+    <!-- Used to differentiate between desktop and non-desktop devices. -->
+    <bool name="desktop_form_factor">false</bool>
 </resources>