Correct PUG-Filters incorrectly marked as syntax--invalid and syntax--illegal

[karland]

Description

Correct PUG-Code with filters defined at PUG filters incorrectly marked as .syntax--invalid and .syntax--illegal.

To see wrong syntax-highlighting type into any .pug-file:

div
  :markdown-it(html typographer plugins=['markdown-it-sup', 'markdown-it-deflist', 'markdown-it-attrs'])

[brunowego]

Same here...