fix file closing on windows

weed/storage/needle_map_boltdb.go

@@ -164,6 +164,7 @@ func (m *BoltDbNeedleMap) Delete(key uint64, offset uint32) error {
 }
 
 func (m *BoltDbNeedleMap) Close() {
+	m.indexFile.Close()
 	m.db.Close()
 }
 

weed/storage/needle_map_leveldb.go

@@ -126,6 +126,7 @@ func (m *LevelDbNeedleMap) Delete(key uint64, offset uint32) error {
 }
 
 func (m *LevelDbNeedleMap) Close() {
+	m.indexFile.Close()
 	m.db.Close()
 }