termite: fix vte patch "expose-function-for-getting-the-selected-text" (#122467)

ZHF: #122042

pkgs/applications/terminal-emulators/termite/vte-ng-modified-patches/vte-0005-expose-function-for-getting-the-selected-text.patch

···
 +vte_terminal_get_selection(VteTerminal *terminal) noexcept
 +{
 +	g_return_val_if_fail(VTE_IS_TERMINAL(terminal), NULL);
-+	return g_strdup (IMPL(terminal)->m_selection[VTE_SELECTION_PRIMARY]->str);
++	return g_strdup (IMPL(terminal)->m_selection[vte::to_integral(vte::platform::ClipboardType::PRIMARY)]->str);
 +}
 +
  /**