Fix bug with project root generation

[ikripaka]

• This PR suggests a bug fix and I've added the necessary tests.
• This PR introduces a new feature and I've discussed the update in an Issue or with the team.
• This PR is just a minor change like a typo fix.

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Related to #139.

How to reproduce?

• Create files simf/nested/nested_2/util.simf, simf/nested/nested_2/assert_eq.simf with such content.
  simf/nested/nested_2/util.simf

use merkle::build_root::{get_root, hash as and_hash};
use std::lib::asserts::assert_eq_32;

pub fn get_block_value_hash(prev_hash: u32, tx1: u32, tx2: u32) -> u32 {
    let root: u32 = get_root(tx1, tx2);
    jet::xor_32(prev_hash, root)
}

simf/nested/nested_2/assert_eq.simf

use std::lib::asserts::assert_eq_32;
use crate::nested::nested_2::util::get_block_value_hash;

fn main() {
    let first_value: u32 = 22;
    let second_value: u32 = 22;
    assert_eq_32(first_value, second_value);
}

Simplex will fail to generate the correct dependency root for a nested module.

Solution:

• Build a dependency map starting from root, not from the parent directory to the contract.

[LesterEvSe]

LGTM

[Arvolear]

LGTM!