fix: remove unused SandboxMemoryLayout import

The GuestCounter constructor now uses scratch_mem directly instead of
computing an offset from SandboxMemoryLayout::BASE_ADDRESS.

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

src/hyperlight_host/src/sandbox/uninitialized.rs

@@ -29,8 +29,6 @@ use crate::func::host_functions::{HostFunction, register_host_function};
 use crate::func::{ParameterTuple, SupportedReturnType};
 #[cfg(feature = "build-metadata")]
 use crate::log_build_details;
-#[cfg(feature = "nanvix-unstable")]
-use crate::mem::layout::SandboxMemoryLayout;
 use crate::mem::memory_region::{DEFAULT_GUEST_BLOB_MEM_FLAGS, MemoryRegionFlags};
 use crate::mem::mgr::SandboxMemoryManager;
 use crate::mem::shared_mem::ExclusiveSharedMemory;