reddit: malformed preview links

Replace "&amp;" for "&" 

From
```https://preview.redd.it/r9nos7fldtib1.png?width=375&amp;format=png&amp;auto=webp&amp;s=2325b3d17dcd9583f8513d464e64c893a239acd4```
To
```https://preview.redd.it/r9nos7fldtib1.png?width=375&format=png&auto=webp&s=2325b3d17dcd9583f8513d464e64c893a239acd4```