Save the content updated by the event handler.

[usualoma]

Related Ticket:

Description of Changes:

If "content" is updated in "SaveContent" or "RawSaveContent", the updated "content" should be saved.
This behavior is also used in the following code.

tinymce/modules/tinymce/src/core/main/ts/api/EditorUpload.ts

Lines 247 to 249 in 47f4372

	editor.on('RawSaveContent', (e) => {
	e.content = replaceBlobUris(e.content);
	});

Pre-checks:

• Changelog entry added
• Tests have been added (if applicable)
• Branch prefixed with feature/, hotfix/ or spike/

Review:

• Milestone set
• Docs ticket created (if applicable)

GitHub issues (if applicable):