remove dead namecoinNameService declaration from AppModules

The NamecoinNameService.init() singleton was the only consumer of
the companion object removed in the previous commit. The
namecoinNameService val itself was never referenced — namecoinResolver
is what's wired into Nip05Client.

amethyst/src/main/java/com/vitorpamplona/amethyst/AppModules.kt

@@ -163,9 +163,6 @@ class AppModules(
                 }
             },
         )
-    val namecoinNameService =
-        com.vitorpamplona.amethyst.service.namecoin.NamecoinNameService
-            .init(namecoinElectrumxClient)
     val nip05Client = Nip05Client(nip05Fetcher, namecoinResolver)
 
     // Application-wide block height request cache