[FIX] web: force formatType for float_time after instanciation

Since in hr_timesheet, we are binding 'timesheet_uom' widget
on existing one (and it might change according to the session
info), we came to the case a formatType is different from the
one of the widget in the registry. Then, the AbstractField
fallbacks on the field type as formatter. Example;
timesheet_uom widget is blind on float_time, but their keys
are differents in field registry, so the formatter will be
'float' and not 'float_time'.

This commit override the formatType determined by the
AbstractField for the float_time widget.

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

@@ -896,6 +896,11 @@ var FieldFloatTime = FieldFloat.extend({
     // 'float_time', but for the sake of clarity, we explicitely define a
     // FieldFloatTime widget with formatType = 'float_time'.
     formatType: 'float_time',
+
+    init: function () {
+        this._super.apply(this, arguments);
+        this.formatType = 'float_time';
+    }
 });
 
 var FieldFloatFactor = FieldFloat.extend({