acp: Don't display failed terminal call on display only terminals (#39780)

We don't get an ExitStatus from a remote terminal, so this check was
failing.

Ideally we move all of this to just needing an exit code, but we will
have to revisit that later.

Release Notes:

- N/A

crates/agent_ui/src/acp/thread_view.rs

@@ -2727,7 +2727,7 @@ impl AcpThreadView {
         let output_line_count = output.map(|output| output.content_line_count).unwrap_or(0);
 
         let command_failed = command_finished
-            && output.is_some_and(|o| o.exit_status.is_none_or(|status| !status.success()));
+            && output.is_some_and(|o| o.exit_status.is_some_and(|status| !status.success()));
 
         let time_elapsed = if let Some(output) = output {
             output.ended_at.duration_since(started_at)