Fix Zed not entering disconnected state when remote proxy dies (#47659)

When I kill the remote proxy, it seems like `ssh` exits with code -1.
Since that's less than or equal to 0, this means we don't try to restart
the connection. The proxy really shouldn't exit for any reason, so let's
get rid of this check altogether.

Release Notes:

- N/A

Co-authored-by: Lukas Wirth <me@lukaswirth.dev>

crates/remote/src/remote_client.rs

@@ -841,7 +841,7 @@ impl RemoteClient {
                                 })?;
                             }
                         }
-                    } else if exit_code > 0 {
+                    } else {
                         log::error!("proxy process terminated unexpectedly: {exit_code}");
                         this.update(cx, |this, cx| {
                             this.reconnect(cx).ok();