PersonCardTest#assertCardDisplay(...): Change parameter order
PersonCardTest#assertCardDisplay(...): Change parameter order

The parameter type order for PersonCardTest#assertCardDisplay(int,
ReadOnlyPerson) is different from PersonCard#PersonCard(ReadOnlyPerson,
int).

It would be nice if they are symmetric to each other.

Let's change the parameter order of
PersonCardTest#assertCardDisplay(...) to match
PersonCard#PersonCard(...).

CS2103R-Eugene-Peh/addressbook-level4,damithc/addressbook-level4,CS2103R-Eugene-Peh/addressbook-level4,CS2103R-Eugene-Peh/addressbook-level4,se-edu/addressbook-level3,damithc/addressbook-level4,damithc/addressbook-level4