[FIX] mrp: 'To consume' field disappear

The custom 'to consume' widget wrap the classic float widget into a
<span> tag to add a non editable part to display. The issue this commit
fix is the following: the float widget element is this.$el in
_renderEdit. Appending it to a new element make it loose its link to the
DOM. The custom widget is totally blank.
This commit clone this.$el before surrounding it by the new span

Task : 2278147

closes odoo/odoo#54042

X-original-commit: 01bb1fce77cce3d54cd969e643b7c720673f2b22
Related: odoo/upgrade#1451
Related: odoo/enterprise#11645
Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

addons/mrp/static/src/js/mrp_should_consume.js

@@ -50,7 +50,7 @@ var MrpShouldConsume = FieldFloat.extend({
         // without losing track of the actual input.
         var def = this._super.apply(this, arguments);
         if (this.displayShouldConsume) {
-            var $container = this._addShouldConsume(this.$el, this.should_consume_qty);
+            var $container = this._addShouldConsume(this.$el.clone(), this.should_consume_qty);
             $container.addClass('o_row');
             this.$el = $container;
         };