Update default pam service name to 'tde'

acinclude.m4.in

@@ -4471,7 +4471,7 @@ AC_DEFUN([KDE_PAM], [
     AC_HELP_STRING([--with-pam[=ARG]],[enable support for PAM: ARG=[yes|no|service name]]),
     [ if test "x$withval" = "xyes"; then
         want_pam=yes
-        pam_service=kde
+        pam_service=tde
       elif test "x$withval" = "xno"; then
         want_pam=no
       else