Block: fixed use of full meta as variant in several cases

fixes #2940

now I need to go to the bathroom and wash this off my hands ... I'd forgotten how nasty this code is

src/pocketmine/block/Leaves2.php

@@ -44,6 +44,6 @@ class Leaves2 extends Leaves{
 	}
 
 	public function canDropApples() : bool{
-		return $this->meta === self::DARK_OAK;
+		return $this->getVariant() === self::DARK_OAK;
 	}
 }