fix: update nix-index-database hmModules to homeModules

The nix-index-database flake output was renamed from hmModules to homeModules.
Update the reference in lib/hosts.nix to resolve the evaluation warning.

Author: stackptr

lib/hosts.nix

@@ -37,7 +37,7 @@ inputs @ {
     home-manager.users.${username} = {...}: {
       imports =
         [
-          nix-index-database.hmModules.nix-index
+          nix-index-database.homeModules.nix-index
           agenix.homeManagerModules.default
           ./../modules/home
           ./../home