Adding dark theme for AddItemActivity

Bug: 117786476
Change-Id: I1a3adb7c10ed2326dc1440c3db15f702f42dbfd8
diff --git a/AndroidManifest-common.xml b/AndroidManifest-common.xml
index 8f4d5be..c626615 100644
--- a/AndroidManifest-common.xml
+++ b/AndroidManifest-common.xml
@@ -122,7 +122,7 @@
                        android:value="true" />
 
         <activity android:name="com.android.launcher3.dragndrop.AddItemActivity"
-            android:theme="@android:style/Theme.DeviceDefault.Light.Dialog.Alert"
+            android:theme="@style/AppItemActivityTheme"
             android:excludeFromRecents="true"
             android:autoRemoveFromRecents="true"
             android:label="@string/action_add_to_workspace" >