Remove temporary asset module files as early as possible

[mar-v-in]

Follow up from #2506

To make sure we don't require more disk space than strictly needed to download assets, we should make an attempt to download temporary files from asset module downloads as early as possible. See https://github.com/microg/GmsCore/pull/2506/files#diff-86f4eabecedcf18b6fb1492c68bdaad2852bc161ad4366c43672511882366aa9R134