project_search: Add ability to search only for opened files (#16580)

Any suggestion?

Release Notes:
  - add ability for project search only for opend files.

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/terminal_view/src/terminal_view.rs

@@ -1245,6 +1245,7 @@ impl SearchableItem for TerminalView {
                     query.include_ignored(),
                     query.files_to_include().clone(),
                     query.files_to_exclude().clone(),
+                    None,
                 )
                 .unwrap()),
             ),