chore: remove useless code

Author: SoonIter

packages/core/src/asset/assetConfig.ts

@@ -121,18 +121,16 @@ const pluginLibAsset = ({ bundle }: { bundle: boolean }): RsbuildPlugin => ({
 
       // css-asset
       // preserve './' in css url
-      // https://github.com/web-infra-dev/rspack/pull/8946
+      // in bundleless, we set this in libCssExtractLoader
+      // in bundle, we set this by https://github.com/web-infra-dev/rspack/pull/8946
       if (bundle) {
         config.plugins.get(CHAIN_ID.PLUGIN.MINI_CSS_EXTRACT)?.tap((options) => {
-          if (bundle) {
-            return [
-              {
-                ...options[0],
-                enforceRelative: true,
-              },
-            ];
-          }
-          return options;
+          return [
+            {
+              ...options[0],
+              enforceRelative: true,
+            },
+          ];
         });
       }
     });