[FIX] hr_timesheet: add missing dependency for timesheet_uom widget

The `timesheet_uom` widget is a proxy to another widget (configurable
server-side). We need to ensure the widget registry is filled before
using it to avoid a fallback to `float_factor` widget.

closes odoo/odoo#34350

Signed-off-by: Christophe Simonis <chs@odoo.com>

addons/hr_timesheet/static/src/js/timesheet_uom.js

@@ -6,6 +6,7 @@ var basicFields = require('web.basic_fields');
 var fieldUtils = require('web.field_utils');
 
 var fieldRegistry = require('web.field_registry');
+var _registry = require('web._field_registry');  // wait registry to be filled...
 var session = require('web.session');
 
 /**
@@ -75,7 +76,6 @@ var FieldTimesheetToggle = basicFields.FieldFloatToggle.extend({
  * implementation (float_time, float_toggle, ...). The default
  * value will be 'float_factor'.
 **/
-var FieldTimesheetUom = FieldTimesheetFactor;
 var widgetName = 'timesheet_uom' in session ?
          session.timesheet_uom.timesheet_widget : 'float_factor';
 var FieldTimesheetUom = widgetName === 'float_toggle' ?
@@ -90,7 +90,7 @@ var _tweak_options = function(options) {
         options.factor = session.timesheet_uom_factor;
     }
     return options;
-}
+};
 
 fieldUtils.format.timesheet_uom = function(value, field, options) {
     options = _tweak_options(options || {});
@@ -106,4 +106,3 @@ fieldUtils.parse.timesheet_uom = function(value, field, options) {
 
 return FieldTimesheetUom;
 });
-