Set base topics 'instance_of' property to be 'BaseTopic' (instead of 'Topic')

[Brett Alistair Kromkamp]

Source:

• topic-db/topicdb/core/store/topicstore.py

  Line 2137 in 444856a

   def initialise_topic_map(self, map_identifier: int, user_identifier: int) -> None: 

• topic-db/topicdb/core/store/topicstore.py

  Line 70 in 444856a

   self.base_topics = { 

[Brett Alistair Kromkamp]

Having the base topics as instances of 'BaseTopic' instead of 'Topic' will make it easier to filter out these topics to display non-system topics.

'BaseTopic' vs. ' SystemTopic'?

[Brett Alistair Kromkamp]

Done!