Auto merge of #19709 - CYBAI:servo-display-out-of-mako, r=emilio

style: Remove -servo-display-for-hypothetical-box from longhand

This is a sub-PR of #19015
r? emilio

For the `fn set_original_display` inside `properties.mako.rs`, I removed `is_item_or_root` first to see how the tests result is. If it's needed, I'll add it back.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #19697
- [x] These changes do not require tests

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components/style/values/specified/box.rs

@@ -228,7 +228,6 @@ impl Display {
         _declaration: &PropertyDeclaration,
         context: &mut Context
     ) {
-        longhands::_servo_display_for_hypothetical_box::derive_from_display(context);
         longhands::_servo_text_decorations_in_effect::derive_from_display(context);
     }
 }