Revert "syncthing: add mail dir"

This reverts commit adbaa9ebbc.

Turns out, mbsync adds hostname to every mail file. And that makes
things pretty awkward, often syncthing same mail file multiple times.
Since I do not expect to have hermes and phoebe running simultaneously
most of the time, I think it is fine to sync mail to both independently
of each other.

hosts/bebop/syncthing.nix

@@ -43,11 +43,6 @@
           type = "receiveonly";
         };
 
-        mail = {
-          devices = [ "hermes" "phoebe" ];
-          type = "receiveonly";
-        };
-
         Music = {
           devices = [ "hermes" "Childish Tycoon" "phoebe" ];
           type = "receiveonly";

hosts/hermes/syncthing.nix

@@ -41,12 +41,6 @@
           fsWatcherEnabled = true;
         };
 
-        mail = {
-          devices = [ "bebop" "phoebe" ];
-          type = "sendreceive";
-          fsWatcherEnabled = true;
-        };
-
         Music = {
           enable = true;
           devices = [ "bebop" "Childish Tycoon" "phoebe" ];

hosts/phoebe/syncthing.nix

@@ -43,12 +43,6 @@
           type = "sendreceive";
         };
 
-        mail = {
-          devices = [ "hermes" "bebop" ];
-          type = "sendreceive";
-          fsWatcherEnabled = true;
-        };
-
         Music = {
           devices = [ "hermes" "Childish Tycoon" "bebop" ];
           type = "sendreceive";

modules/common-syncthing.nix

@@ -86,12 +86,6 @@ in
           path = "~/org";
         };
 
-        mail = {
-          id = "kpznt-cyugo";
-          label = "mail";
-          path = "~/.mail";
-        };
-
         Pictures = {
           id = "rjozc-vd3hh";
           label = "Pictures";