keymap: Update Prev to Previous follow-up (#25931)

Follow-up for https://github.com/zed-industries/zed/pull/25909

Add three more action replacements:

```
1. "pane::ActivatePrevItem" -> "pane::ActivatePreviousItem"
2. "vim::MoveToPrev" -> "vim::MoveToPrevious"
3. "vim:MoveToPrevMatch" -> "vim:MoveToPreviousMatch" 
```

Release Notes:

- N/A

crates/migrator/src/migrator.rs

@@ -482,6 +482,9 @@ static STRING_REPLACE: LazyLock<HashMap<&str, &str>> = LazyLock::new(|| {
         ("file_finder::SelectPrev", "file_finder::SelectPrevious"),
         ("menu::SelectPrev", "menu::SelectPrevious"),
         ("editor::TabPrev", "editor::Backtab"),
+        ("pane::ActivatePrevItem", "pane::ActivatePreviousItem"),
+        ("vim::MoveToPrev", "vim::MoveToPrevious"),
+        ("vim::MoveToPrevMatch", "vim::MoveToPreviousMatch"),
     ])
 });