Fix undefined selector.inside in WPD

[vrana]

https://prismjs.com/plugins/wpd/ currently errors with:

prism-wpd.js:10 Uncaught TypeError: Cannot set properties of undefined (setting 'pseudo-class')
at prism-wpd.js:10:56
at prism-wpd.js:154:2

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[github-actions]

JS File Size Changes (gzipped)

A total of 1 files have changed, with a combined diff of -6 B (-0.5%).

file	master	pull	size diff	% diff
plugins/wpd/prism-wpd.min.js	1.28 KB	1.28 KB	-6 B	-0.5%

Generated by 🚫 dangerJS against 1f8728b