Fixes WallpaperPickerGoogle Studio build

Fixes the resource issues introduced to Studio by ag/25842216 and ag/25839209

Fixes: 323334670
Flag: NONE
Test: Manually built and ran all AOSP and Google targets
Test: Manually ran instrumented and deviceless tests for all targets in
Studio and with atest

Change-Id: I4aa91e6a22f2eb825e770dcd4049ce312d66038d
diff --git a/Android.bp b/Android.bp
index 4b78713..8676f26 100644
--- a/Android.bp
+++ b/Android.bp
@@ -127,6 +127,7 @@
 //
 android_app {
     name: "ThemePicker",
+    package_name: "com.android.wallpaper",
     defaults: ["ThemePicker_defaults"],
 
     platform_apis: true,
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index de4737c..6e5844d 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1,7 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
+
+<!-- The package name here must match the Studio namespace given in
+     WallpaperPickerGoogle gradle config for Studio builds to succeed.
+     `package_name` in Android.bp overrides this with the actual package name.
+ -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           xmlns:tools="http://schemas.android.com/tools"
-          package="com.android.wallpaper">
+          package="com.google.android.apps.wallpaper">
 
     <uses-sdk android:targetSdkVersion="30" android:minSdkVersion="28"/>