remove out-dated comment

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@39807 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.db.select/main.c

@@ -227,7 +227,6 @@ int main(int argc, char **argv)
 
 	if (r_flag->answer) {
 	    /* get minimal region extent */
-	    /* TODO: support layer name */
 	    Vect_cidx_find_all(&Map, Vect_get_field_number(&Map, field_opt->answer), -1, cat, list_lines);
 	    for (i = 0; i < list_lines->n_values; i++) {
 		line = list_lines->value[i];