Rename fosscord in settings window

[mak448a]

Is your feature request related to a problem? Please describe. Fosscord rebranded as SpaceBar. So it would be nice if the update was reflected in the "Discord Instance" section.

Describe the solution you'd like Rename the entry.

[NotAShelf]

perhaps with a note that indicates it's former name - i.e "SpaceBar (formerly Fosscord)"

[SpacingBat3]

I won't rename it for v4 for now, I dunno what about v5 as god knows how I'm going to handle ~~Fosscord~~ SpaceBar instance switching given I had some plans to re-design app with BrowserView-s and therefore make UI less native and more Discord-fitting – BrowserView-s can be transparent and displayed on-top of the current site, so this makes it possible to visually inject some stuff on the webpage without actually making it accessible to Discord.