Update the account::set_map_item procedure

[Fumuran]

What should be done?

Currently set_map_item procedure from the kernel lib requires the input stack to be [index, KEY, NEW_VALUE, OLD_ROOT], where the index is the index of the storage slot where root of the tree is stored. This root is exactly the same as OLD_ROOT, so it could be removed from the inputs data and obtained inside the procedure.

How should it be done?

OLD_ROOT word should be removed from the inputs of the kernel account::set_map_item procedure, this root should be obtained inside this procedure using the provided storage slot index.

When is this task done?

This task is done when the old root is removed from the inputs of the set_map_item procedure.

Additional context

No response

[bobbinth]

Once this is done, we should be able to simplify mint_non_fungible_asset and burn_non_fungible_asset procedures a bit (and maybe some others).