coerce api_lookup customer attrs to text when imported into job type

When a customer_lookup attribute imports fields from a customer type,
any api_lookup fields are flattened to plain text — the value comes
from the selected customer record, so the lookup UI is not needed

public/js/app.js

@@ -1202,14 +1202,15 @@ window.jobTypeForm = function (initialAttributes, customerTypes) {
             var imported = ct.attributes.slice().sort(function (a, b) {
                 return (a.order || 0) - (b.order || 0);
             }).map(function (a) {
+                var importedType = (a.type === 'api_lookup') ? 'text' : (a.type || 'text');
                 return {
                     name:             a.name  || '',
-                    type:             a.type  || 'text',
+                    type:             importedType,
                     alias:            a.alias || '',
                     order:            0,
-                    api_url:          a.api_url         || '',
-                    api_match_field:  a.api_match_field || '',
-                    api_auto_fill:    a.api_auto_fill   || '',
+                    api_url:          '',
+                    api_match_field:  '',
+                    api_auto_fill:    '',
                     api_format:       a.api_format      || 'json',
                     api_return_type:  a.api_return_type || 'text',
                     customer_type_id: 0,