Fix comment parsing (#12750)

Co-authored-by: Erovia <[email protected]>

lib/python/qmk/c_parse.py

@@ -8,7 +8,7 @@ from milc import cli
 from qmk.comment_remover import comment_remover
 
 default_key_entry = {'x': -1, 'y': 0, 'w': 1}
-single_comment_regex = re.compile(r' */[/*].*$')
+single_comment_regex = re.compile(r'\s+/[/*].*$')
 multi_comment_regex = re.compile(r'/\*(.|\n)*?\*/', re.MULTILINE)