Shortcodes: ensure that we generate RTL & min files for slideshows

[jeherve]

Changes proposed in this Pull Request:

Up until now, no rtl files or min files were generated when running yarn build.
This caused issues on RTL sites, but also in other places where we look for the file,
like in the work we are doing in #10102

Testing instructions:

Apply this branch, run yarn build, and check for 2 new minified files and an RTL file under modules/shortcodes/css/.

You can also check that the slideshows look good on a site using an RTL language.

Proposed changelog entry for your changes:

Shortcodes: ensure we build minified and RTL stylesheets for slideshows.

[jetpackbot]

That's a great PR description, thank you so much for your effort!

Generated by 🚫 dangerJS

[georgestephanis]

Yarp, especially as it's flagged to swap to the rtl version.

jetpack/modules/shortcodes/slideshow.php

Line 282 in ce014ac

wp_style_add_data( 'jetpack-slideshow', 'rtl', 'replace' );

My guess is that it's heretofore been relying on wpcom side of the sync to manage the changes over. Better that we do it ourselves, methinks.