Copy link copies link for your instance and not source URL

**Is your feature request related to a problem? Please describe.** I find it annoying when I copy a link and to send to someone and it copies the link from the original instance and not the one I have my account on. I prefer viewing posts through my instance and would like other people who click on the links I send them (often non-fediverse users) to have the same consistent experience on every link I send them. It also can make it more obvious to them what they're clicking is on `mastodon.social` or if they've seen links from my instance before and not on a random instance with a non-obvious instance name. **Describe the solution you'd like** A toggle in settings that would allow me to change between copying original links like `https://social.vivaldi.net/@Vivaldi/115728747391375438` and copying links to the posts from my instance, like `https://mastodon.social/@Vivaldi@vivaldi.net/115728749757698116`