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/common.nix

@@ -51,12 +51,12 @@ rec {
         builtins.toString (mkHashFile name value.hashedPassword)
       else
         value.passwordFile
-    ) cfg.loginAccounts;
+    ) cfg.accounts;
 
   # Collect accounts with plain text passwords that require hashing
-  accountsWithPlaintextPasswordFiles = lib.filter (
-    name: cfg.loginAccounts.${name}.passwordFile != null
-  ) (builtins.attrNames cfg.loginAccounts);
+  accountsWithPlaintextPasswordFiles = lib.filter (name: cfg.accounts.${name}.passwordFile != null) (
+    builtins.attrNames cfg.accounts
+  );
 
   # Appends the LDAP bind password to files to avoid writing this
   # password into the Nix store.