helix: Fix replace in helix mode (#34789)

Closes https://github.com/zed-industries/zed/issues/33076

Release Notes:

- Fixed replace command on helix mode: now it actually replaces what was
selected and keeps the replaced text selected to better match helix

crates/vim/src/vim.rs

@@ -1639,6 +1639,7 @@ impl Vim {
                 Mode::Visual | Mode::VisualLine | Mode::VisualBlock => {
                     self.visual_replace(text, window, cx)
                 }
+                Mode::HelixNormal => self.helix_replace(&text, window, cx),
                 _ => self.clear_operator(window, cx),
             },
             Some(Operator::Digraph { first_char }) => {