Simplify mapping constructor

If the variable name is equal to the key of the mapping constructor, we can simplify code {k: k} to {k}.

Bad Code

type Student record {|
    string name;
    int age;
    string city;
|};

function registerStudent(string name, int age) {
    Student s = {name: name, age: age, city: "London"};
    //...
}

Good Code

type Student record {|
    string name;
    int age;
    string city;
|};

function registerStudent(string name, int age) {
    Student s = {name, age, city: "London"};
    //...
}