Fix variable import path in magnific-popup settings (#298)

Author: DiogoRibeiro7

_sass/minimal-mistakes/vendor/magnific-popup/_settings.scss

@@ -1,5 +1,5 @@
 @use 'sass:math';
-@use "../../variables" as *;
+@use "minimal-mistakes/variables" as *;
 ////////////////////////
 //      Settings      //
 ////////////////////////