The "use-underline" property needs to be removed from AdwActionRow

There's already the "use-underline" property from HdyPreferencesRow, which causes the notify event to be emitted twice.

Discovered this while writing this test for HdyActionRow:

static void
test_hdy_action_row_use_underline (void)
{
  g_autoptr (HdyActionRow) row = NULL;
  gboolean use_underline = FALSE;

  row = g_object_ref_sink (HDY_ACTION_ROW (hdy_action_row_new ()));
  g_assert_nonnull (row);

  notified = 0;
  g_signal_connect (row, "notify::use-underline", G_CALLBACK (notify_cb), NULL);

  g_object_get (row, "use-underline", &use_underline, NULL);
  g_assert_false (use_underline);

  hdy_action_row_set_use_underline (row, FALSE);
  g_assert_cmpint (notified, ==, 0);

  hdy_action_row_set_use_underline (row, TRUE);
  g_assert_true (hdy_action_row_get_use_underline (row));
  g_assert_cmpint (notified, ==, 1);

  g_object_set (row, "use-underline", FALSE, NULL);
  g_assert_false (hdy_action_row_get_use_underline (row));
  g_assert_cmpint (notified, ==, 2);
}

The test should pass, but it fails