Fix indent level for externally formatted <script> inside control structure

[UnknownPlatypus]

The Doc was nested one level deeper but state.indent_level was left unchanged, so external formatters (in that case, script_formatter) received an undercounted indent hint for scripts inside control structure blocks.

So it was doing that when ran with any js external formater:

 {% if enabled %}
   <script>
-    document.addEventListener("DOMContentLoaded", () => {
-      console.log("nested");
-    });
+  document.addEventListener("DOMContentLoaded", () => {
+  console.log("nested");
+});
   </script>
 {% endif %}

• The pull request description was written manually by me and was not generated by an AI tool or agent.
• I have read and understood the relevant parts of the existing codebase before making these changes.
• I have carefully reviewed and understood all code changes, and ensured that they match the style, architecture, and conventions of the existing codebase.
• I understand that pull requests containing blindly generated or unreviewed AI-generated code may be closed without review.

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