fix(murmur): Increase bitrate to default value

modules/nixos/deertopia/murmur.nix

@@ -26,6 +26,8 @@ in {
         bindport = 64738; # Use default Murmur port, not uMurmur's.
         welcometext = "🦌";
 
+        max_bandwidth = 72000;
+
         # Use files generated by Nix's Nginx module.
         certificate = "/var/lib/acme/deertopia.net/fullchain.pem";
         private_key = "/var/lib/acme/deertopia.net/key.pem";