[Gameplay] Can't invite players for flex 3v3

Currently, there is a ranked restriction for invitations in 3v3 flex queue. It is follow not just the same restrictions for 5v5, but it is using your 5v5 rank to determine these restrictions. If you're Plat 4 in 5's, and your friend is Diamond 5 in 5's, and you're both Plat in 3v3 Flex Queue, you cannot queue together. I understand this restriction for placements, but if you're going to add restrictions, at least apply it to the correct queue.