Fix highlight lint issue

Author: facelessuser

pymdownx/highlight.py

@@ -186,14 +186,12 @@ def _format_custom_line(self, m):
             # wrap the gutter number in the future with a highlight class.
             # The decision to do this has still not be made.
 
-            lnum = m.group(4) if not m.group(4).rstrip() else m.group(4)
-
             return (
                 m.group(1) +
                 m.group(2) +
                 '"' +
                 m.group(3) +
-                ' data-linenos="' + lnum + ' ">' +
+                ' data-linenos="' + m.group(4) + ' ">' +
                 m.group(5)
             )