fix call to OCR when not disabled

ocrloader.py

@@ -22,7 +22,7 @@ def process(cfg, filename, payload, enable_ocr=True):
             fd.write(payload)
             fd.close()
 
-    if not os.path.exists(ocr_filename) and not enable_ocr:
+    if not os.path.exists(ocr_filename) and enable_ocr:
         fd, tmpfilename = tempfile.mkstemp(suffix='.pdf', prefix='ocrloader-')
         os.write(fd, payload)
         os.close(fd)