Disable xpra: need new impl.

Current implementation of xpra overrides sddm && overrides system
sound preferences to enable pulseaudio (not necessary)

machines/kcnhub/servers/xpra.nix

@@ -1,6 +1,6 @@
 { config, pkgs, lib, ...}: {
   services.xserver.displayManager.xpra = {
-    enable = true;
+    enable = false;
 
     # Where to bind port/address:
     bindTcp = "127.0.0.1:10000";
@@ -9,6 +9,6 @@
     auth = "pam";
     
     # Should sound be streamed?
-    pulseaudio = true;
+    pulseaudio = false;
   };
 }