[FIX] web: digits precision

- Remove unnecessary "round_decimals". Will be process by format_value
- Fix json format value for digits attribute

addons/product/views/product_views.xml

@@ -217,7 +217,7 @@
                                 <group name="weight" string="Weights">
                                     <label for="volume"/>
                                     <div class="o_row">
-                                        <field digits="(14, 3)" name="volume"/>
+                                        <field digits="[14, 3]" name="volume"/>
                                         <span>m³</span>
                                     </div>
                                     <label for="weight"/>

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

@@ -562,8 +562,6 @@ var FieldFloat = InputField.extend({
         this._super.apply(this, arguments);
         if (this.attrs.digits) {
             this.nodeOptions.digits = JSON.parse(this.attrs.digits);
-        } else {
-            this.nodeOptions.digits = this.field.digits;
         }
     },
 
@@ -591,11 +589,8 @@ var FieldFloat = InputField.extend({
      * @private
      */
     _renderReadonly: function () {
-        var value = this.value;
-        if (this.nodeOptions.digits && this.nodeOptions.digits.length === 2) {
-            value = utils.round_decimals(value, this.nodeOptions.digits[1]);
-        }
-        var $span = $('<span>').addClass('o_form_field o_form_field_number').text(this._formatValue(value));
+        var value = this._formatValue(this.value);
+        var $span = $('<span>').addClass('o_form_field o_form_field_number').text(value);
         this.$el.html($span);
     },
 });