Fix a few stylistic issues in preparation for Checkstyle addition

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=230524735

java/google/registry/keyring/KeyringModule.java

@@ -14,8 +14,8 @@
 
 package google.registry.keyring;
 
-
 import static com.google.common.base.Preconditions.checkState;
+
 import dagger.Module;
 import dagger.Provides;
 import google.registry.config.RegistryConfig.Config;