Fix issue with ping ponging between the two entrances to the same area

[sorc653]

Sometimes we'll ping pong between the sewers level 1 entrance. I was playing with a new run for palace/harem and noticed I couldn't go from palace level 1 to haram 2 or to palace level 3.

This is because this loop could select the opposing entrance:
for _, l := range ctx.Data.AdjacentLevels

I also attempted to sort this by distance but that might be a little too heavy handed.

Just remembering the entrance we're moving the mouse above makes more sense.

[Antizerg]

This helps people progress through the act 2 leveling script as well. Thanks for putting this together