Remove trailing whitespace in files

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135386752

java/google/registry/model/domain/fee/FeeExtensionCommandDescriptor.java

@@ -56,7 +56,7 @@ public class FeeExtensionCommandDescriptor extends ImmutableObject {
     }
     return CommandName.UNKNOWN;
   }
-  
+
   public static FeeExtensionCommandDescriptor
       create(CommandName commandName, String phase, String subphase) {
     FeeExtensionCommandDescriptor commandDescriptor = new FeeExtensionCommandDescriptor();