Revert "vm: add btrfs"

This reverts commit 7e93688025.

hosts/op5p/configuration.nix

@@ -39,6 +39,5 @@
     hostName = "op5p";
     domain = "jakstys.lt";
     firewall.allowedTCPPorts = [22];
-    hostId = "abefef01";
   };
 }

hosts/vm/configuration.nix

@@ -45,6 +45,5 @@
     hostName = "vm";
     domain = "jakstys.lt";
     firewall.allowedTCPPorts = [22];
-    hostId = "abefef01";
   };
 }

hosts/vno1-op5p/configuration.nix

@@ -83,6 +83,5 @@ in {
     hostName = "vno1-op5p";
     domain = "jakstys.lt";
     firewall.allowedTCPPorts = [22];
-    hostId = "81e10bcc";
   };
 }

modules/base/default.nix

@@ -49,8 +49,6 @@ in {
       };
 
       kernelPackages = lib.mkDefault pkgs.zfs.latestCompatibleLinuxPackages;
-
-      supportedFilesystems = ["zfs" "btrfs"];
     };
 
     nixpkgs.config.allowUnfree = true;