chore: drop the global popovers-registry write — the registry is deleted (Phase 6ae)

The write-only widget::popovers registry (its engine readers went with the
popup path in 6x) is deleted from cce-ui; this was its last clear() call.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/main.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 872daed..e58ad43 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -396,7 +396,6 @@ impl Application for TextEditorApp {
         // clamp). The popover itself draws into this display list below; the global
         // registry fed the engine's render-only xdg popup, which this app no longer uses.
         self.ui_context.clear_popovers();
-        cce_ui::widget::popovers::clear();
         if self.menu_dropdown.popover_rect().is_some() {
             self.ui_context.register_popover(&self.menu_dropdown);
         }