test(get): eval lazy in map that is aliased

This PR make sure lazies in maps that are aliased are evaluated as expect.

```sass
@function hello($name:"world") {
    @return "hello " + $name;
}

// ------------

$settings: set((
    foo: ( bar: ( lazy: lazy("hello"), not-lazy: "normal value" )),
    this: ( is: ( an: ( alias: "foo/bar" ))),
)) !global;

// ------------

@debug(get("this/is/an/alias")); 

```

**Expected** ` ( lazy: "hello world", not-lazy: "normal value" )`

**Actual** `hello world`

Fixes #15.