Fix players getting stuck in rock in map corners when entering a level #1
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This fixes a bug in level flipping where stairs and ladders in their sentinel positions (i.e. x = 0) were being flipped out of them when SporkHack generated random vaults that allowed the level to be flipped (yes, the placement of a single vault can flip THE ENTIRE LEVEL).
This bug could be seen most often when starting a new game, where the upstair is
sstairs(special/branch stairs; a comment inuse_defensive()claims otherwise, but gdb proves it wrong). The start-of-game code callsu_on_upstairs(), which is supposed to put the player on these stairs but instead prioritizes the regular upstairs that have been flipped from x = 0 to x = 79, thus starting the player in the corner of the level surrounded by rock.