Fixed skybox placeholder texture showing for some levels

The win-screen-splash.bin and camp-ending.bin files had a few places where the skybox placeholder texture was being shown. This is because their (upper) walls were not marked as skybox, only their ceilings, and the empty blocks behind them had lower floors. Ideally, the tiles in the levels would have their walls set to skybox, but this will handle it too.

Dungeoneer/src/com/interrupt/dungeoneer/gfx/Tesselator.java

@@ -638,7 +638,7 @@ else if (c.tileSpaceType==TileSpaceType.OPEN_NW) {
 							if (c.isSky() && isOtherSolid) {
 								// This makes the edge of an outdoor map transparent for sky tiles.
 								showWall = false;
-							} else if (isOtherSky && isOtherFloorHigher) {
+							} else if (isOtherSky && (isOtherFloorHigher && !isOtherSolid)) {
 								// Make sure we show the lower portion of a raised sky tile.
 								showWall = true;
 							} else {