[*] Project : Remove duplicated result from Product::getAttributesParams

Before :
```PHP
print_r(Product::getAttributesParams(3, 8)); // product 3 = MacBook Air
```
> Array ( 
>   [0] => Array ( 
>     [name] => Metal 
>     [group] => Couleur 
>   ) 
>   [1] => Array ( 
>     [name] => Disque dur SSD (solid-state drive) de 64 Go 
>     [group] => Capacité 
>   ) 
>   [2] => Array ( 
>     [name] => Intel Core 2 Duo à 1,8 GHz 
>     [group] => ICU 
>   ) 
>   [3] => Array ( 
>     [name] => Metal 
>     [group] => Couleur 
>   ) 
>   [4] => Array ( 
>     [name] => Disque dur SSD (solid-state drive) de 64 Go 
>     [group] => Capacité 
>   ) 
>   [5] => Array ( 
>     [name] => Intel Core 2 Duo à 1,8 GHz 
>     [group] => ICU 
>   ) 
> )

After :
> Array ( 
>   [0] => Array ( 
>     [name] => Metal 
>     [group] => Couleur 
>   ) 
>   [1] => Array ( 
>     [name] => Disque dur SSD (solid-state drive) de 64 Go 
>     [group] => Capacité 
>   ) 
>   [2] => Array ( 
>     [name] => Intel Core 2 Duo à 1,8 GHz 
>     [group] => ICU 
>   ) 
> )