v0.3.0c: centralized general sign placement logic, fixed a bug where traps would sometimes appear over signs.

src/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java

@@ -256,13 +256,7 @@ public class PrisonBossLevel extends RegularLevel {
 			}
 		}
 		
-		while (true) {
-			int pos = roomEntrance.random();
-			if (pos != entrance) {
-				map[pos] = Terrain.SIGN;
-				break;
-			}
-		}
+		placeSign();
 		
 		Point door = roomExit.entrance();
 		arenaDoor = door.x + door.y * WIDTH;