traefik: Increase memory limits for tor container

Apparently 32mb are a bit too little for the DHT. In case a node has no
swap configured, it'll never be able to sue the `memswap_limit`,
resulting in the OOM death of the container on startup.

This patch will fix this problem by doubling the low memory limit for
the container.

roles/traefik/templates/docker-compose.yml

@@ -40,8 +40,8 @@ services:
 {% if traefik_tor_enabled %}
   tor:
     image: quay.io/sheogorath/tor:{{ traefik_tor_version }}
-    mem_limit: 32mb
-    memswap_limit: 64mb
+    mem_limit: 64mb
+    memswap_limit: 128mb
     read_only: true
     depends_on:
       - proxy