modules/avahi: Sync module defaults with upstream

This contribution syncs the module's default with upstream
avahi's defaults.

nixos/doc/manual/release-notes/rl-2505.section.md

@@ -378,6 +378,8 @@
 
   Note that all provided plugins must have versions/tags (string after `@`), even if upstream repo does not tag each release. For untagged plugins, you can either create an empty Go project and run `go get <plugin>` and see changes in `go.mod` to get the pseudo-version number, or provide a commit hash in place of version/tag for the first run, and update the plugin string based on the error output.
 
+- The defaults of `services.avahi.publish` have been updated to upstream's default.
+
 - KDE Partition Manager `partitionmanager`'s support for ReiserFS is removed.
   ReiserFS has not been actively maintained for many years. It has been marked as obsolete since Linux 6.6, and
   [is removed](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c01f664e4ca210823b7594b50669bbd9b0a3c3b0)

nixos/modules/services/networking/avahi-daemon.nix

@@ -175,19 +175,19 @@ in
     publish = {
       enable = lib.mkOption {
         type = lib.types.bool;
-        default = false;
+        default = true;
         description = "Whether to allow publishing in general.";
       };
 
       userServices = lib.mkOption {
         type = lib.types.bool;
-        default = false;
+        default = true;
         description = "Whether to publish user services. Will set `addresses=true`.";
       };
 
       addresses = lib.mkOption {
         type = lib.types.bool;
-        default = false;
+        default = true;
         description = "Whether to register mDNS address records for all local IP addresses.";
       };
 
@@ -210,14 +210,14 @@ in
 
       domain = lib.mkOption {
         type = lib.types.bool;
-        default = false;
+        default = true;
         description = "Whether to announce the locally used domain name for browsing by other hosts.";
       };
     };
 
     nssmdns4 = lib.mkOption {
       type = lib.types.bool;
-      default = false;
+      default = true;
       description = ''
         Whether to enable the mDNS NSS (Name Service Switch) plug-in for IPv4.
         Enabling it allows applications to resolve names in the `.local`