[BUG]: Remove white as a potential colour for edges rendered by the map marker publisher.

[Iranaphor]

Description of the bug

White is in the pool of randomly selected colours for edges, this (and potentially black too) should be removed as they conflict with the metric map making visualisation difficult/confusing at times.

topological_navigation/topological_navigation/topological_navigation/topomap_marker2.py

Line 216 in c9f9ab4

def get_colour(self, number):

This should also problly be set as dynamic too rather than a fixed list.

Steps To Reproduce

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Additional Information

No response