run: explicitly close pty forwarder before printing summary

If the PTY forwarder is still around our TTY will have borked settings,
regarding newlines, hence explicitly close it before showing the
summary, so that it looks pretty.

src/run/run.c

@@ -1059,6 +1059,12 @@ static int start_transient_service(
                 }
 
                 if (!arg_quiet) {
+
+                        /* Explicitly destroy the PTY forwarder, so that the PTY device is usable again, in its
+                         * original settings (i.e. proper line breaks), so that we can show the summary in a pretty
+                         * way. */
+                        c.forward = pty_forward_free(c.forward);
+
                         if (!isempty(c.result))
                                 log_info("Finished with result: %s", strna(c.result));