Since merging #665 `serendipity_plugin_history` breaks with a SQL error message on every archive page but the first one; see #693 for reason and context. Unset `$serendipity['GET']['page']` before calling `serendipity_fetchEntries(`)` (and reset afterwards) to fix that. That's the correct way, I think, as `serendipity_fetchEntries()` is not called in page context here. Signed-off-by: Thomas Hochstein <thh@inter.net>