Fix ass syntax

danmaku2ass.py

@@ -397,7 +397,7 @@ def WriteCommentAcfunPositioned(f, c, width, height, styleid):
     try:
         comment_args = c[3]
         text = ASSEscape(str(comment_args['n']).replace('\r', '\n'))
-        common_styles = ['\org(%d, %d)' % (width / 2, height / 2)]
+        common_styles = ['\\org(%d, %d)' % (width / 2, height / 2)]
         anchor = {0: 7, 1: 8, 2: 9, 3: 4, 4: 5, 5: 6, 6: 1, 7: 2, 8: 3}.get(comment_args.get('c', 0), 7)
         if anchor != 7:
             common_styles.append('\\an%s' % anchor)