Refactoring the osd logic

Author: int3l

src/pytesseract.py

@@ -342,7 +342,7 @@ def image_to_osd(image,
     '''
     Returns string containing the orientation and script detection (OSD)
     '''
-    config += ' -psm 0' if get_tesseract_version() < '3.05' else ' --psm 0'   
+    config += ' -{}psm 0'.format('' if get_tesseract_version() < '3.05' else '-')
     args = [image, 'osd', lang, config, nice]
 
     if output_type == Output.DICT: