Fixed some lines indented with 4 spaces rather than tabs

src/pocketmine/nbt/NBT.php

@@ -108,7 +108,7 @@ class NBT{
 		}
 
 		$item = Item::get($tag->id->getValue(), !isset($tag->Damage) ? 0 : $tag->Damage->getValue(), $tag->Count->getValue());
-		
+
 		if(isset($tag->tag) and $tag->tag instanceof CompoundTag){
 			$item->setNamedTag($tag->tag);
 		}

src/pocketmine/nbt/tag/StringTag.php

@@ -26,7 +26,7 @@ use pocketmine\nbt\NBT;
 #include <rules/NBT.h>
 
 class StringTag extends NamedTag{
-	
+
 	public function getType(){
 		return NBT::TAG_String;
 	}