Remove some no-longer-needed item classes

src/pocketmine/block/FlowerPot.php

@@ -48,7 +48,7 @@ class FlowerPot extends Flowable{
 	}
 
 	public function getName() : string{
-		return "Flower Pot Block";
+		return "Flower Pot";
 	}
 
 	protected function recalculateBoundingBox(){

src/pocketmine/block/IronDoor.php

@@ -37,7 +37,7 @@ class IronDoor extends Door{
 	}
 
 	public function getName() : string{
-		return "Iron Door Block";
+		return "Iron Door";
 	}
 
 	public function getToolType() : int{

src/pocketmine/block/Skull.php

@@ -49,7 +49,7 @@ class Skull extends Flowable{
 	}
 
 	public function getName() : string{
-		return "Mob Head Block";
+		return "Mob Head";
 	}
 
 	protected function recalculateBoundingBox(){