Migrate ENABLE_ALL_APPS_BUTTON_IN_HOTSEAT to launcher.aconfig

Flag: com.android.launcher3.enable_all_apps_button_in_hotseat
Test: N/A
Bug: 270393897
Change-Id: Ib62a2f46a440d8f0d3f569c09c4f8754715db4ee
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index c0cdb9a..43b92fa 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -405,3 +405,10 @@
     description: "Show an 'Undo' snackbar when users dismiss a predicted hotseat item"
     bug: "270394476"
 }
+
+flag {
+    name: "enable_all_apps_button_in_hotseat"
+    namespace: "launcher"
+    description: "Enables displaying the all apps button in the hotseat."
+    bug: "270393897"
+}