Fix torches not being able to be placed on walls

src/main/java/vazkii/botania/common/block/decor/walls/BlockModWall.java

@@ -39,6 +39,11 @@ public class BlockModWall extends BlockWall implements ILexiconable {
 		setBlockName(block.getUnlocalizedName().replaceAll("tile.", "") + meta + "Wall");
 	}
 
+	@Override
+	public boolean canPlaceTorchOnTop(World world, int x, int y, int z) {
+		return true;
+	}
+	
 	@Override
 	public Block setBlockName(String par1Str) {
 		register(par1Str);