Improve popup.vars error message

[olivroy]

Example

# before
NLD_prov |> 
	tm_shape() +
	tm_polygons(fill = "pop_25_44", popup.vars = c("pop_45_64", "origin_native2"))
#> Incorrect popup.vars specification.
# Now
NLD_prov |> 
	tm_shape() +
	tm_polygons(fill = "pop_25_44", popup.vars = c("pop_45_64", "origin_native2"))
#> ! `popup.vars` must be one of "code", "name", "population",
#>  "pop_men", "pop_women", "pop_0_14", "pop_15_24", "pop_25_44",
#> "pop_45_64", "pop_65plus", "origin_native", "origin_west", or
#>   "origin_non_west", not "origin_native2".
ℹ Did you mean "origin_native"?

TODO :

• fill : currently Incorrect Id
• legend more precise message

+ v3 code detected: as of tmap v4, the legend should be specified for each visual variable (e.g. with the argument fill.legend = tm_legend() of tm_polygons to control the legend of `fill` for polygons.
- v3 code detected: as of tmap v4, tm_legend should be specified per visual variable (e.g. with the argument fill.legend of tm_polygons

[mtennekes]

Thx @olivroy