scroll_pane: remove unused blanket impls for Vec<Line> and Text

Co-Authored-By: Kent Overstreet <kent.overstreet@gmail.com>

src/user/scroll_pane.rs

@@ -28,17 +28,6 @@ impl<'a> ScrollItem for Line<'a> {
     }
 }
 
-impl<'a> ScrollItem for Vec<Line<'a>> {
-    fn content(&self) -> Text<'_> {
-        Text::from(self.clone())
-    }
-}
-
-impl<'a> ScrollItem for Text<'a> {
-    fn content(&self) -> Text<'_> {
-        self.clone()
-    }
-}
 
 // ── State ──────────────────────────────────────────────────────