urlwatch: set dataDir to home of urlwatch user

otherwise /var/empty will be used which then will clash
with exim which tries to create Maildir in this folder
explicitly setting the home directory in users also
avoids the usage of execstartpre in favor of createHome

krebs/3modules/urlwatch.nix

@@ -142,17 +142,6 @@ let
         PrivateTmp = "true";
         SyslogIdentifier = "urlwatch";
         Type = "oneshot";
-        ExecStartPre =
-          pkgs.writeDash "urlwatch-prestart" ''
-            set -euf
-
-            dataDir=$HOME
-
-            if ! test -e "$dataDir"; then
-              mkdir -m 0700 -p "$dataDir"
-              chown ${user.name}: "$dataDir"
-            fi
-          '';
         ExecStart = pkgs.writeDash "urlwatch" ''
           set -euf
 
@@ -185,6 +174,8 @@ let
     };
     users.extraUsers = singleton {
       inherit (user) name uid;
+      home = cfg.dataDir;
+      createHome = true;
     };
   };