Update pulseaudio module

[lgoette]

Description of changes

• Change pulseaudio module to set permission of pulse's home directory to 755 when running in "systemWide" mode
  -> The start-script of the pulseaudio daemon changes the permission to 755, but this gets reset on rebuild (with changes not regarding pulseaudio, so the daemon is not restarted)
  -> with the homeMode option, this gets set to 755 on rebuild

-> Fixes Issue, described in #114399

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/)
• 24.05 Release Notes (or backporting 23.11 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.

[lgoette]

I know, it sounds weird to give a home directory 755 permissions but this is actually intended by pulseaudio as you can see here:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/blob/master/src/pulsecore/core-util.c#L1763-1771
Pulse sets the permission to 755 when running in system-wide mode and sets it to 700 otherwise.

[AndersonTorres]

Reword the commit message:

nixos/pulseaudio: set permission of pulse home directory

Closes #114399

[emilytrau]

Rebased and merged. Thank you for your contribution!