vimPlugins.fidget-nvim: switch branch from legacy to main

[GaetanLepage]

Description of changes

The fidget.nvim plugin has been going through a substantial rewrite lately. Hence, the nixpkgs was set to target the legacy branch as recommended by the devs.
Now, the rewrite has been completed so we should go back and use the default branch.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.11 Release Notes (or backporting 23.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

Priorities

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[GaetanLepage]

Result of nixpkgs-review pr 269831 run on x86_64-linux 1

1 package built:

• vimPlugins.fidget-nvim

[teto]

impossible not to merge after this great motivation message ;)
I've done the migration myself and it was pretty smooth, it just complained about an outdated setting and kept working.