Redesign: Fix feature flag attribute not being applied when only server-side flag is enabled (#40547)

app/javascript/inline/theme-selection.js

@@ -21,13 +21,4 @@
 
   updateColorScheme();
   updateContrast();
-
-  const isRedesignEnabled = (
-    window.localStorage.getItem('experiments')?.split(',') ?? []
-  ).includes('redesign');
-
-  if (isRedesignEnabled) {
-    element.dataset.redesign = true;
-  }
-
 })(document.documentElement);