[FIX] web: MonetaryField: read currency_field in options

In the xml definition of views, a 'currency_field' can be specified
in the node options:

<field name="amount" widget='monetary'
       options="{'currency_field': 'currency_id'}"/>

It indicates which field the monetary widget has to use to
determine the currency to display.

Before this rev., the widget didn't look for the 'currency_field'
in the options, but directly in the node attrs, so this simply
didn't work. This was for example the case on the crm.lead kanban
and form views.

addons/web/static/src/js/fields/basic_fields.js

@@ -548,7 +548,7 @@ var FieldMonetary = InputField.extend({
      * @private
      */
     _setCurrency: function () {
-        var currencyField = this.attrs.currency_field || this.field.currency_field || 'currency_id';
+        var currencyField = this.nodeOptions.currency_field || this.field.currency_field || 'currency_id';
         var currencyID = this.record.data[currencyField] && this.record.data[currencyField].res_id;
         this.currency = session.get_currency(currencyID);
     },

addons/web/static/tests/fields/basic_fields_tests.js

@@ -1769,6 +1769,37 @@ QUnit.module('basic_fields', {
         form.destroy();
     });
 
+    QUnit.test('monetary field with monetary field given in options', function (assert) {
+        assert.expect(1);
+
+        this.data.partner.fields.qux.type = "monetary";
+        this.data.partner.fields.company_currency_id = {
+            string: "Company Currency", type: "many2one", relation: "currency",
+        };
+        this.data.partner.records[4].company_currency_id = 2;
+
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch:'<form string="Partners">' +
+                    '<sheet>' +
+                        '<field name="qux" options="{\'currency_field\': \'company_currency_id\'}"/>' +
+                        '<field name="company_currency_id"/>' +
+                    '</sheet>' +
+                '</form>',
+            res_id: 5,
+            session: {
+                currencies: _.indexBy(this.data.currency.records, 'id'),
+            },
+        });
+
+        assert.strictEqual(form.$('.o_field_monetary').html(), "9.10&nbsp;€",
+            "field monetary should be formatted with correct currency");
+
+        form.destroy();
+    });
+
     QUnit.test('should keep the focus when being edited in x2many lists', function (assert) {
         assert.expect(6);