UX: ensure CSS vars are loaded in the Wizard stylesheet

The in-app select-kit stylesheet references some of the CSS vars we recently added. This commit ensures that those vars are available when that sheet is complied since the wizard lives outside of the app.

app/assets/stylesheets/wizard.scss

@@ -1,3 +1,4 @@
+@import "color_definitions";
 @import "vendor/normalize";
 @import "vendor/normalize-ext";
 @import "vendor/sweetalert";