Adding rendering for black hiking trails

In Poland, marking hiking trails are available in five standard colors: red, green, yellow, blue and black.

I would like to ask for the rendering for the following combination of tags: osmc: symbol: black: white: black_bar

See also:
https://github.com/osmandapp/OsmAnd-resources/pull/59
https://github.com/osmandapp/OsmAnd-resources/pull/62
Merge pull request #63 from KKlim/patch-2

Adding rendering for black hiking trails