bug with custom_labels in _topics_over_time.py

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Hi,
it seems there is a bu in _topics_over_time.py when using custom_labels. In line 67, you loop over topics, but I think it should be selected_topics. My local fix for this line is:

topic_names = [[[str(topic), None]] + topic_model.topic_aspects_[custom_labels][topic] for topic in selected_topics]

Furthermore, line 70 also break down, as you are iterating over all topics and topic_names many not include all of them. I have changed it to:

topic_names = {key: topic_names[index] for index, key in enumerate(selected_topics)}

Start in _topics_over_time.py at lines 67 and 70, then reproduce the custom_labels case with a subset of selected_topics. Verify that topic names are generated and mapped only for the selected topics, and confirm the behavior with the relevant existing tests or a focused reproduction.

Written by the indexing model from the issue text.