Render leisure=sports_centre same as leisure=fitness_centre

[tguen]

leisure=fitness_centre has an icon and the name is rendered in green text, even combined with building=*. leisure=sports_centre has no icon, and the name is only rendered in green if not tagged with building=*. When a building is tagged as a fitness_centre there is no indication that the tag is present. This seems to incorrectly indicate that leisure=sports_centre is a less important tag. IMO it would be better to render sports_centre the same as fitness_centre, although probably with a different icon. Maybe even a set of icons for common values of sport=*?

Example

[imagico]

There are multiple separate issues here:

• That we render leisure=sports_centre - which is predominantly used on polygons - as a landcover tag with fill and label while we render leisure=fitness_centre - which is predominantly used on nodes - as a POI tag with point symbol and label. That is already discussed to some extent in #2930.
• That our label styling for POIs is highly inconsistent, for example leisure=fitness_centre uses a different label styling on nodes compared to when used on building polygons (compare https://www.openstreetmap.org/way/91140032 and https://www.openstreetmap.org/node/1871766687). This is partly already covered by #4620.
• That our treatment of ambiguous name tagging (like with leisure=fitness_centre + building=yes + name=X - where it is semantically unclear if X is the name of the building or of the fitness centre) is not very consistent. Discussed in a different case in #4739.
• The idea of visualizing sport=* on various features in some way - see #844.

If you have a concrete suggestion that does not belong to any of the mentioned issues please say so. If you have ideas on any of these issues please comment there.