Revert "leftover css should read from unclaimed modules (#1098)"

This reverts commit 2f48c89.

Author: Conduitry

src/core/create_compilers/extract_css.ts

@@ -253,7 +253,11 @@ export default function extract_css(
 		fs.writeFileSync(`${asset_dir}/${file}`, replaced);
 	});
 
-	const leftover = get_css_from_modules(Array.from(unclaimed), css_map, asset_dir);
+	unclaimed.forEach(file => {
+		entry_css_modules.push(file);
+	});
+
+	const leftover = get_css_from_modules(entry_css_modules, css_map, asset_dir);
 	if (leftover) {
 		let { code, map } = leftover;