- When a D3D11 texture was created with a mip level count of zero,
DXVK would compute the correct number of mip levels, but not write
them back to the description field.
- Framebuffers would always use the size of the top level, not the
mip levels that were actually attached to the framebuffer.
- Several image copy operations did not handle mip levels other
than the top mip level correctly.
