Fix rust snapshot

Author: hyf0

crates/rspack_loader_sass/tests/fixtures/rspack_importer/expected/main.css

@@ -1,7 +1,6 @@
 .color-red {
   color: red;
 }
-
 @charset "UTF-8";
 body {
   font: 100% Helvetica, sans-serif;
@@ -31,4 +30,4 @@ nav a {
 }
 .bar:before {
   content: "∑";
-}
+}