Number of routes is not displayed in tmux status

Number of routes is not displayed in tmux status. Looks like the tmuxinator watch + pipe expression needs more quotes + escaping. This works from the command line:

```
ssh frontend -t watch -d "'echo \"number of proxy routes\"; grep location /webapps/pouta_blueprints/run/proxy_conf.d/proxy.conf | wc -l'"
```

Start by locating the tmux status configuration and the tmuxinator watch plus pipe expression described in the issue. Compare it with the working command-line example, then verify that the tmux status displays the number of proxy routes and that the route count remains correct when the configuration changes.

Written by the indexing model from the issue text.