Fix destination reset after configuration change

Also enable predictive back gesture for Gallery App.

Bug: 244122804
Test: Manual with Gallery App
Change-Id: I68bb694c87b2614aa908f1e973aea8fa7288f47c
diff --git a/packages/SettingsLib/Spa/gallery/AndroidManifest.xml b/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
index e5bf8ca..e34fedd 100644
--- a/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
+++ b/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
@@ -20,7 +20,8 @@
     <application
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_label"
-        android:supportsRtl="true">
+        android:supportsRtl="true"
+        android:enableOnBackInvokedCallback="true">
         <activity
             android:name=".MainActivity"
             android:exported="true">