🐛 Fixed file inputs not allowing same file to be re-uploaded in Firefox
🐛 Fixed file inputs not allowing same file to be re-uploaded in Firefox

closes https://github.com/TryGhost/Ghost/issues/11707

- Firefox is different to every other browser and doesn't allow file input values to be reset by doing `input.value = null`
- outcome of reset not working is that Firefox won't trigger the change event when the same file is re-selected
- fixed by cloning the input element and replacing it

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost