HasOwnProperty should call GetOwnProperty and not GetProperty

[n14little]

Describe the bug
According to the spec, HasOwnProperty should be calling GetOwnProperty. However, Boa is calling getProperty as seen here: https://github.com/boa-dev/boa/blob/master/boa/src/builtins/object/mod.rs#L611

To Reproduce

var x = { someProp: 1 };
console.log(x.hasOwnProperty('someProp');
console.log(x.hasOwnProperty('hasOwnProperty');

Expected behavior
The above code should return true and false, respectively. However, Boa is returning true for both.

Build environment (please complete the following information):

• OS: Ubuntu Linux
• Version: 20.04
• Target triple: x86_64-unknown-linux-gnu
• Rustc version: 1.43.1 (8d69840ab 2020-05-04)

Additional context
You can find more information on MDN.

[n14little]

I'll also take the issue.