mod_unified_push: Increase expiration

[stratself]

From the Conversations MUC, it seems like Conversations renews when the endpoint is less than a day from expiry. This makes it always retry a new endpoint even when maximum expiration is set in mod_unified_push. This seems unnecessary and can strain resources - especially with Android apps that always attempt to check for push registrations on startup.

Conversations' reference implementation, up Rewrite Proxy, also implements 7 days of expiry. Ntfy does 60 days.

Therefore, I'm advocating for increasing this expiration value to a default of 7 days with a maximum of 60 days.

[licaon-kter]

Why not set it yourself?

modules:
  mod_unified_push:
    expiration: 7days

or whatever the syntax for day was

[stratself]

``` Error: "Invalid value of option modules->mod_unified_push->expiration: Expected integer from 0 to 86400, got: 86401" ```

…

[licaon-kter]

Ah, the setting is broken 🤦 thanks for the PR