Don't auto backup for MusicFX app

Set allowBackup to false in AndroidManifest.xml
to prevent auto backup for MusicFX app.

- MusicFX stores package name for having audio effect function
  in preference. In case of user changes product, MusicFX should launch
  audio effect app in new device app. But auto backup prevent it.

- auto backup functionality for this app is already blocked by
  system filter. But each app should disable it if there is no
  good reason for auto backup not to rely on system filter.

Bug: 31351681

Change-Id: Ibe36541f62e6b27ce8e90218c5fe59c67e4059da
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0a12bd0..f2b6482 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -28,7 +28,8 @@
     <application
         android:icon="@drawable/icon"
         android:label="@string/app_name"
-        android:theme="@android:style/Theme.NoTitleBar">
+        android:theme="@android:style/Theme.NoTitleBar"
+        android:allowBackup="false">
         <activity
             android:name=".ActivityMusic"
             android:theme="@android:style/Theme.Material.Light"