Revert "Adds modern wallpaper pickers to AOSP installs"

This reverts commit af76a986082730f009bf5d55159f4504041b4fdb.

Reason for revert: To fix regression test failure on 'WallpaperPickerGoogleTests'
Bug: 297301079

Change-Id: Id9eb21db31182c68551ef9e3c3d4d258879c541b
diff --git a/target/product/aosp_product.mk b/target/product/aosp_product.mk
index 78506f6..e396ad1 100644
--- a/target/product/aosp_product.mk
+++ b/target/product/aosp_product.mk
@@ -32,7 +32,6 @@
     messaging \
     PhotoTable \
     preinstalled-packages-platform-aosp-product.xml \
-    ThemePicker \
     WallpaperPicker \
 
 # Telephony: