Deleted Resource Pack Files Not Actually Deleted

When a resource pack is deleted, the list of known valid packs is updated, but the file doesn't get deleted.

Steps to Reproduce:

1. Download a resource pack (not from the marketplace)
2. Delete the resource pack
3. Go to the resource pack folder (\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\resource_packs)

Expected Result:

The file in the resource pack folder gets deleted

Observed Result:

The file in the resource pack folder still exists