Fix empty-block.zst golden decompression file

This frame is invalid because the `Window_Size = 0`, and the
`Block_Maximum_Size = min(128 KB, Window_Size) = 0`. But the empty
compressed block has a `Block_Content` size of 2, which is invalid.

The fix is to switch to using a `Window_Descriptor` instead of the
`Single_Segment_Flag`. This sets the `Window_Size = 1024`.

Hexdump before this PR: `28b5 2ffd 2000 1500 0000 00`

Hexdump after this PR: `28b5 2ffd 0000 1500 0000 00`

For issue #3482.