capture: add task-id (thread-id) to samples

This could let us do some amount of filtering by threads going
forward if we have that data available to us.

src/tools/sysprof-cat.c

@@ -317,6 +317,7 @@ main (gint   argc,
                                                 frame->frame.time,
                                                 frame->frame.cpu,
                                                 frame->frame.pid,
+                                                frame->tid,
                                                 addrs,
                                                 frame->n_addrs);
                 }