Clean up some io close() calls

src/main/java/com/sk89q/worldedit/data/LegacyChunkStore.java

@@ -120,7 +120,7 @@ public abstract class LegacyChunkStore extends ChunkStore {
 
             return rootTag;
         } finally {
-            stream.close();
+            nbt.close();
         }
     }
 

src/main/java/com/sk89q/worldedit/data/McRegionChunkStore.java

@@ -104,7 +104,7 @@ public abstract class McRegionChunkStore extends ChunkStore {
 
             return rootTag;
         } finally {
-            stream.close();
+            nbt.close();
         }
     }
 

src/main/java/com/sk89q/worldedit/schematic/MCEditSchematicFormat.java

@@ -68,6 +68,7 @@ public class MCEditSchematicFormat extends SchematicFormat {
 
         // Schematic tag
         CompoundTag schematicTag = (CompoundTag) nbtStream.readTag();
+        nbtStream.close();
         if (!schematicTag.getName().equals("Schematic")) {
             throw new DataException("Tag \"Schematic\" does not exist or is not first");
         }