[FIX] runbot: fix jsonb in list view

In view list widget are not always instanciated and a formater is used
instead. This means that the t-esc will try to output a jsonb field
without nowing how to render it, making the page crash.

This is quickly fixed by forcing the widget on the field in tree view.

runbot/static/src/js/fields/fields.js

@@ -20,7 +20,7 @@ function stringify(obj) {
 export class JsonField extends TextField {
     static template = xml`
     <t t-if="props.readonly">
-            <span t-esc="value" />
+            <span t-esc="value"/>
         </t>
         <t t-else="">
             <div t-ref="div">
@@ -37,7 +37,6 @@ export class JsonField extends TextField {
         </t>
     `;
     setup() {
-        this.props.value.toString = () => stringify(this.props.value);
         if (this.props.dynamicPlaceholder) {
             this.dynamicPlaceholder = useDynamicPlaceholder();
         }

runbot/views/bundle_views.xml

@@ -106,7 +106,7 @@
                 <field name="trigger_id"/>
                 <field name="config_id"/>
                 <field name="extra_params"/>
-                <field name="config_data"/>
+                <field name="config_data" widget="jsonb"/>
             </tree>
         </field>
     </record>