[FIX] web: transfer context to underlying many2one in reference field

Fixes #11955 (loss of context in many2one subwidget)
Closes #11957

addons/web/static/src/js/view_form.js

@@ -5570,6 +5570,7 @@ instance.web.form.FieldReference = instance.web.form.AbstractField.extend(instan
         this.m2o = new instance.web.form.FieldMany2One(fm, { attrs: {
             name: 'Referenced Document',
             modifiers: JSON.stringify({readonly: this.get('effective_readonly')}),
+            context: this.build_context().eval(),
         }});
         this.m2o.on("change:value", this, this.data_changed);
         this.m2o.appendTo(this.$(".oe_form_view_reference_m2o"));