[FIX] web_editor: images stored as base64-encoded sources

Commit [1] introduced an option in the Wysiwyg widget to save pasted
and dropped images as attachments instead of keeping them as inline
base64-encoded sources.

In order to prevent records from having excessively large sizes in their
html field content, this commit makes such option the default one for
the Wysiwyg class.

task-3289061

[1]: https://github.com/odoo/odoo/commit/b8e7fb4a5ec8c75deff37dc1737b6a3d3b123cc3

closes odoo/odoo#130213

X-original-commit: 7e06b40ea58f58069729f881f7d4559d17778fe7
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/wysiwyg/wysiwyg.js

@@ -262,6 +262,7 @@ export class Wysiwyg extends Component {
         insertParagraphAfterColumns: true,
         onHistoryResetFromSteps: () => {},
         autostart: true,
+        dropImageAsAttachment: true,
     }
     init() {
         this.id = ++id;

addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js

@@ -152,7 +152,6 @@ export class WysiwygAdapterComponent extends Wysiwyg {
         this.options.toolbarHandler = $('#web_editor-top-edit');
         // Do not insert a paragraph after each column added by the column commands:
         this.options.insertParagraphAfterColumns = false;
-        this.options.dropImageAsAttachment = true;
 
         const $editableWindow = this.$editable[0].ownerDocument.defaultView;
         // Dropdown menu initialization: handle dropdown openings by hand