Follow up from iteration 1 task T290046, the intended behaviour after a user rejects an image is that they should be shown the post-edit dialog.
See figma spec: https://www.figma.com/file/ULhJr1isDstRbGE5vjYDsr/Add-images-structured-task?node-id=3018%3A9307
Note: @MRaishWMF and @Dyolf77_WMF noted that having to 'confirm' the rejection as an added step was a pain point/unexpected during pre-release testing with arwiki newcomers on in Week 47.