Fix(epaint): just realized that I forgot to remove a change I said I reverted

crates/epaint/src/text/cursor.rs

@@ -69,13 +69,6 @@ impl std::ops::SubAssign<usize> for CCursor {
     }
 }
 
-impl PartialOrd for CCursor {
-    #[inline]
-    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.index.partial_cmp(&other.index)
-    }
-}
-
 /// Row/column cursor.
 ///
 /// This refers to rows and columns in layout terms--text wrapping creates multiple rows.