Fix invalid swim collision from water gate dungeon tag

[scawful]

The Zora Temple includes an additional section of rooms which make use of the water gate dungeon tag to fill the room with water after the follower activates the switch for Link. Currently, the shape of the water is correct however when Link attempts to swim through the water he cannot movie.

Custom collision isn't a good option currently as it would allow Link to swim through the area before the water mask from the gate has been added, unless I could conditionally activate custom collision.