Hardcoded /w/ folder in pivot.css leads to resource failure

[lizardkg]

Setup

• Browsers and versions: All
• MediaWiki version: 1.37
• Database version: N/A
• PHP version: N/A
• Pivot version:
• Extension version (if connected to the issue): N/A

Issue

pivot.css line 1155 calls /w/ folder. Websites no using this configuration fail to load resource.
.mw-content-ltr .magnify a {
background-image: url(/w/resources/src/mediawiki.skinning/images/magnify-clip-ltr.png);