only-office: pin the machine side of its port

A bare '80' tried to bind the node's port 80 — the edge's — instead of
auto-allocating. 9070 is the predecessor's number and the one the route
contribution already names.

modules/only-office/module.json

@@ -99,7 +99,7 @@
         "/var/lib/only-office/server.env"
       ],
       "ports": [
-        "80"
+        "9070:80"
       ],
       "volumes": [
         "/services/only-office/logs:/var/log/onlyoffice",