Add last window closed setting (#25185)

Release Notes:

- Added an `on_last_window_closed` setting, that allows users to quit
the app when the last window is closed

---------

Co-authored-by: Richard <richard@zed.dev>

crates/cli/src/main.rs

@@ -121,7 +121,7 @@ fn main() -> Result<()> {
     // Intercept version designators
     #[cfg(target_os = "macos")]
     if let Some(channel) = std::env::args().nth(1).filter(|arg| arg.starts_with("--")) {
-        // When the first argument is a name of a release channel, we're gonna spawn off a cli of that version, with trailing args passed along.
+        //When the first argument is a name of a release channel, we're gonna spawn off a cli of that version, with trailing args passed along.
         use std::str::FromStr as _;
 
         if let Ok(channel) = release_channel::ReleaseChannel::from_str(&channel[2..]) {