linux: Save opened workspace when closing last window (#15754)

Fixes https://github.com/zed-industries/zed/issues/15642
(also fixes a bug where replacing a workspace in the same window would
reopen the old project after closing with `CTRL + Q`)

Release Notes:

- Linux: Fixed last workspace not being restored on startup
([#15642](https://github.com/zed-industries/zed/issues/15642)).
- Fixed a bug where a closed workspace could be reopened on startup.

crates/zed/src/zed.rs

@@ -35,6 +35,7 @@ use std::{borrow::Cow, ops::Deref, path::Path, sync::Arc};
 use task::static_source::{StaticSource, TrackedFile};
 use theme::ActiveTheme;
 use workspace::notifications::NotificationId;
+use workspace::CloseIntent;
 
 use paths::{local_settings_file_relative_path, local_tasks_file_relative_path};
 use terminal_view::terminal_panel::{self, TerminalPanel};
@@ -621,7 +622,7 @@ fn quit(_: &Quit, cx: &mut AppContext) {
         for window in workspace_windows {
             if let Some(should_close) = window
                 .update(&mut cx, |workspace, cx| {
-                    workspace.prepare_to_close(true, cx)
+                    workspace.prepare_to_close(CloseIntent::Quit, cx)
                 })
                 .log_err()
             {