omni: add overlay for dark Launcher3

Change-Id: Ibc1c257bd9f58f93543b37b24597add54c375942
diff --git a/config/packages.mk b/config/packages.mk
index c018676..09db12b 100644
--- a/config/packages.mk
+++ b/config/packages.mk
@@ -52,5 +52,8 @@
 PRODUCT_PACKAGES += \
     PixelTheme
 
+PRODUCT_PACKAGES += \
+    Launcher3Dark
+
 # for fun
 PRODUCT_PACKAGES += EggGame