[FIX] web: Can't save a x2m in list editable if contains a m2m_tags with a color field

m2m_tags inlist editable view try to get color on validation, the field is invalid because the mutex is pending.
Fix: don't re-render the fields

Issue: steps to reproduce:
- Create a new instance, install "sale"
- Create a product "prepayment", service, invoice on ordered qties
- Create aproduct "project phase", service, invoice on delivered qties, manually track delivered qties
- Create a SO with once prepayment, and twice a line with "project phase". ( the name (description) of the lines should be "phase 1" and "phase 2" )
- Create invoice => The prepayment is invoiced
- Go back to the SO, try to change the delivered qties of the first phase to 1
- Save => error, odoo doesn't let you save.

addons/web/static/src/js/views/form_relational_widgets.js

@@ -969,7 +969,10 @@ var X2ManyListView = ListView.extend({
         var valid = _.every(cached_records, function(record){
             _.each(fields, function(field){
                 var value = record.values[field.name];
+                var tmp = field.no_rerender;
+                field.no_rerender = true;
                 field.set_value(_.isArray(value) && _.isArray(value[0]) ? [COMMANDS.delete_all()].concat(value) : value);
+                field.no_rerender = tmp;
             });
             return _.every(fields, function(field){
                 field.process_modifiers();