[FIX] web_{editor}: add missing args in position callback

Before this commit:

When attempting to open a dynamic placeholder in email marketing, a traceback
occurs.

After this commit:

Now the dynamic placeholder works properly.

Task-3373356

closes odoo/odoo#129415

X-original-commit: bb9fb402a135baf7e7b9da9bbb40888f5323ded9
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web/static/src/views/fields/dynamic_placeholder_hook.js

@@ -13,7 +13,7 @@ export function useDynamicPlaceholder(elementRef) {
     let positionCallback;
     const popover = usePopover(DynamicPlaceholderPopover, {
         onclose: () => closeCallback?.(),
-        onPositioned: () => positionCallback?.(),
+        onPositioned: (popper, position) => positionCallback?.(popper, position),
     });
     const notification = useService("notification");
 

addons/web_editor/static/src/js/backend/html_field.js

@@ -343,7 +343,7 @@ export class HtmlField extends Component {
             // Ensure the focus is in the editable document
             // before inserting the <t> element.
             this.wysiwyg.focus();
-            let dynamicPlaceholder = "object." + chain.join('.');
+            let dynamicPlaceholder = "object." + chain;
             dynamicPlaceholder += defaultValue && defaultValue !== '' ? ` or '''${defaultValue}'''` : '';
             const t = document.createElement('T');
             t.setAttribute('t-out', dynamicPlaceholder);