fish theme files renamed

due to ctp/fish's inclusion into fish 4.4 [we've renamed the files on our side](https://github.com/catppuccin/fish/commit/5fc5ae9c2ec22eb376cb03ce76f0d262a38960f3) to match theirs. i believe this will have an impact on ctp/nix so i'm raising this as a notification. sorry for the disruption! `Catppuccin Frappe.theme` → `catppuccin-frappe.theme` `Catppuccin Macchiato.theme` → `catppuccin-macchiato.theme` `Catppuccin Mocha.theme` → `catppuccin-mocha.theme` `Catppuccin Latte.theme` → `catppuccin-latte.theme`