Fix link check in test_pages

The anchor to https://github.com/niklasnolte/HLT_2Track/blob/main/hlt2trk/utils/config.py#L384 was no longer being found. This does not seem related to any changes in that file, since the last ones were in February 2023. The correct anchor for the event types should in fact be https://github.com/niklasnolte/HLT_2Track/blob/main/hlt2trk/utils/config.py#407, but also this anchor does not pass the link check. There seems to be a problem in the link checking, when using anchors.

For lack of time to further investigate, I have fixed the link w/o using the anchor.