Improve Farore's Wind textbox for Ganon Castle and Ganon's Tower areas

[GSKirox]

The changes introduced in #2302 to add the dungeon name to Farore's Wind return textbox leave an ambiguity for when the return point is either in Ganon's Castle or Ganon's Tower.
Currently both cases will display "Return to Ganon".
Since shuffling Ganon's Tower is possible since #2063, this distinction can be very relevant.

So one first thing would be to at the very least, display either Ganon's Castle or Ganon's Tower.

Another thing is that Ganon's Tower is not a real area considered in the rest of the randomizer's logic, so if we want parity it should actually display the region where Ganon's Tower is in.

[fenhl]

We've discussed this and the way FW works is different enough compared to warp songs or owls that it probably makes more sense for it to just say “Ganon's Tower” rather than the hint area. Changing the dungeon names to say “Forest Temple” instead of “Forest” and “Ganon's Castle” instead of “Ganon” also makes sense.