fix bug where import of own files in detect_barcodes did not work

Author: rkpfeil

detect_barcodes.py

@@ -20,7 +20,7 @@
 import pysam
 from Bio import SeqIO
 import logging
-from barcode_calling.barcode_callers import (
+from barcode_extraction.barcode_callers import (
     TenXBarcodeDetector,
     DoubleBarcodeDetector,
     IlluminaDoubleBarcodeDetector,