Fill in missing arg for arg_match in list_field_domains

[elipousson]

I used encode_field_values() with the field argument set this evening for the first time and caught what is (in retrospect) an obvious error in the arg_match call used by list_field_domains() to validate the input.

Changes

Fill in field as the arg parameter of rlang::arg_match within list_field_domains().

[JosiahParry]

We should add a test for this:

library(arcgislayers)

flayer <- arc_open("https://services1.arcgis.com/99lidPhWCzftIe9K/ArcGIS/rest/services/UtahRoads/FeatureServer/0")

res <- arc_select(flayer, n_max = 100)

encode_field_values(res, flayer, field = "CARTOCODE")