Fix styling of MR dropdown in Web IDE

Fix a regression from MR:
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/26448
which broke the MR / branch dropdown

app/assets/stylesheets/page_bundles/ide.scss

@@ -967,7 +967,7 @@ $ide-commit-header-height: 48px;
 }
 
 .ide-nav-form {
-  li {
+  .nav-links li {
     width: 50%;
     padding-left: 0;
     padding-right: 0;

changelogs/unreleased/213307-fix-ide-scss-regression.yml

+---
+title: Fix styling of MR dropdown in Web IDE
+merge_request: 28746
+author:
+type: fixed