Fix linting issues in tty_test.go

- Replace context.Background() with context.WithCancel() in test
- Fix formatting issues (remove extra empty line)

Signed-off-by: maks2134 <maks210306@yandex.by>

cmd/display/tty_test.go

@@ -429,7 +429,7 @@ func TestDoneDeadlockFix(t *testing.T) {
 	addTask(w, "test-task", "Working", "details", api.Working)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	
+
 	w.Start(ctx, "test")
 	done := make(chan bool)
 	go func() {