[FIX] website: prevent having multiple logos for a website

Before this commit, when a user was uploading a logo for a website via
the website configurator, the logo was added as an attachment but the
potential previous logo was not deleted. This commit fixes this by
deleting the previous logo when a new one is uploaded.

Steps to reproduce the issue:
- Create a new website
- Fill the configurator until you can upload a logo
- Upload a logo, then upload another one
- Finish the configurator
- Edit a page of the website
- Change an image

=> You can see the first logo you uploaded in the list of images.

task-3609329

Part-of: odoo/odoo#145047

addons/website/static/src/client_actions/configurator/configurator.js

@@ -238,6 +238,7 @@ class PaletteSelectionScreen extends Component {
     async changeLogo() {
         const logoSelectInput = this.logoInputRef.el;
         if (logoSelectInput.files.length === 1) {
+            const previousLogoAttachmentId = this.state.logoAttachmentId;
             const file = logoSelectInput.files[0];
             const data = await getDataURLFromFile(file);
             const attachment = await this.rpc('/web_editor/attachment/add_data', {
@@ -246,6 +247,9 @@ class PaletteSelectionScreen extends Component {
                 'is_image': true,
             });
             if (!attachment.error) {
+                if (previousLogoAttachmentId) {
+                    await this._removeAttachments([previousLogoAttachmentId]);
+                }
                 this.state.changeLogo(data, attachment.id);
                 this.updatePalettes();
             } else {
@@ -277,6 +281,16 @@ class PaletteSelectionScreen extends Component {
         this.state.selectPalette(paletteName);
         this.props.navigate(ROUTES.featuresSelectionScreen);
     }
+
+    /**
+     * Removes the attachments from the DB.
+     *
+     * @private
+     * @param {Array<number>} ids the attachment ids to remove
+     */
+    async _removeAttachments(ids) {
+        this.rpc("/web_editor/attachment/remove", { ids: ids });
+    }
 }
 
 Object.assign(PaletteSelectionScreen, {