Translating `colour` in `SETTING` clause

[teunbrand]

Currently gives an error, e.g.:

VISUALISE bill_len AS x, bill_dep AS y FROM ggsql:penguins
  DRAW point SETTING colour => 'red'
#> Failed to execute query: Validation error: Layer 1: Invalid setting 'colour' for geom 'point'. 
#> Valid settings are: pos1, pos2, size, stroke, fill, opacity, shape, linewidth