chore: Fix refining_impl_trait lint occurences (#11979)

These show up when compiling Zed with latest nightly, which means that
we'd have to do it one or two Rust releases down the line.
Release Notes:

- N/A

crates/project_panel/src/project_panel.rs

@@ -1899,7 +1899,7 @@ impl Render for ProjectPanel {
 }
 
 impl Render for DraggedProjectEntryView {
-    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl Element {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
         let settings = ProjectPanelSettings::get_global(cx);
         let ui_font = ThemeSettings::get_global(cx).ui_font.family.clone();
         h_flex()