[DO NOT MERGE] Add android:relinquishTaskIdentity for multi-pane am: 917945d037

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/16091757

Change-Id: I7bfc803828e8748e769e61e0a579e128220adef0
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index ccadc12..c6e79a9 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -52,6 +52,7 @@
             tools:node="replace"
             android:name="com.android.wallpaper.picker.CustomizationPickerActivity"
             android:label="@string/app_name"
+            android:relinquishTaskIdentity="true"
             android:resizeableActivity="false"
             android:theme="@style/CustomizationTheme.NoActionBar"
             android:exported="false"/>