phone: Allow olm for now

Used by chatty for Matrix support, however I don't use Chatty for
this feature.

See: https://gitlab.gnome.org/World/Chatty/-/issues/932

Author: donovanglover

Diff for: hosts/phone/configuration.nix

@@ -213,6 +213,10 @@ in
     };
   };
 
+  nixpkgs.config.permittedInsecurePackages = [
+    "olm-3.2.16"
+  ];
+
   modules = {
     system = {
       hostName = "mobile-nixos";