Referenced images are not displayed in journal notes.

### Reproduction

1. Go to https://preview.openproject.org
2. Select ticket [2415](https://preview.openproject.org/work_packages/2415)
3. See comment Begin of the insertion[2](https://www.openproject.org/work_packages/2415#note-2)End of the insertion Begin of the deletion [2](https://www.openproject.org/issues/2415#note-2)End of the deletion and Begin of the insertion[4](https://www.openproject.org/work_packages/2415#note-4)End of the insertion Begin of the deletion [4](https://www.openproject.org/issues/2415#note-4)End of the deletion

### Behavior

**Expected:** Images are displayed as intended (see Begin of the insertion[2415](https://www.openproject.org/work_packages/2415)End of the insertion Begin of the deletion [2415](https://www.openproject.org/issues/2415)End of the deletion on openproject.org for comparison)
**Actual:** Images are not displayed