Rename mailserver.loginAccounts to mailserver.accounts

The "login" prefix makes this option more confusing rather than clearer,
because what other account types are there? LDAP ones for example, but
you can login with those too, so the prefix is pointless.

mail-server/users.nix

@@ -86,7 +86,7 @@ let
                 rm "${sieveDirectory}/${name}/default.svbin"
               fi
             ''
-        ) (map (user: { inherit (user) name sieveScript; }) (lib.attrValues loginAccounts))}
+        ) (map (user: { inherit (user) name sieveScript; }) (lib.attrValues accounts))}
       '';
 in
 {
@@ -102,14 +102,14 @@ in
           ]
         ) == 1;
       message = "Login account ${acct.name} must provide exactly one of password file, hashed password, or hashed password file";
-    }) (lib.attrValues loginAccounts);
+    }) (lib.attrValues accounts);
 
     # warn for accounts that specify both password and file
     warnings =
       map (acct: "${acct.name} specifies both a password hash and hash file; hash file will be used")
         (
           lib.filter (acct: (acct.hashedPassword != null && acct.hashedPasswordFile != null)) (
-            lib.attrValues loginAccounts
+            lib.attrValues accounts
           )
         );