When completions menu is displayed above cursor, reverse order (#23446)

Considered doing this when previously working on completions menu
layout, as it brings the default selection position next to the cursor
position, and is generally more symmetrical. With #23445 there is now a
more compelling reason, as the "translucent, cropped bottom" display
doesn't make sense when displayed above.

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -5246,11 +5246,12 @@ impl Editor {
         &self,
         style: &EditorStyle,
         max_height_in_lines: u32,
+        y_flipped: bool,
         cx: &mut ViewContext<Editor>,
     ) -> Option<AnyElement> {
         self.context_menu.borrow().as_ref().and_then(|menu| {
             if menu.visible() {
-                Some(menu.render(style, max_height_in_lines, cx))
+                Some(menu.render(style, max_height_in_lines, y_flipped, cx))
             } else {
                 None
             }