matrix.nix: Remove spaces_enabled flag (now enabled by default)

Spaces are an experimental matrix feature, but as of Synapse 1.35, it is
enabled by default.

See matrix-org/synapse#10011

Signed-off-by: Roosembert Palacios <[email protected]>

Author: roosemberth

nix/machines/containers/matrix.nix

@@ -40,9 +40,6 @@
         max_upload_size = "100M";
         url_preview_enabled = true;
         report_stats = true;
-        extraConfig = assert pkgs.matrix-synapse.version == "1.34.0"; ''
-          experimental_features: { spaces_enabled: true }
-        '';
         inherit (secrets.matrix)
           turn_uris
           turn_shared_secret