aimedb: Remove ident fields from Goodbye message

They're not present in this message, it's just zero bytes.

src/aimedb/decoder.ts

@@ -63,7 +63,6 @@ function readHelloRequest(msg: Buffer): Request.HelloRequest {
 
 function readGoodbyeRequest(msg: Buffer): Request.GoodbyeRequest {
   return {
-    ...begin(msg),
     type: "goodbye",
   };
 }

src/aimedb/request.ts

@@ -33,7 +33,7 @@ export interface HelloRequest extends AimeRequestBase {
   type: "hello";
 }
 
-export interface GoodbyeRequest extends AimeRequestBase {
+export interface GoodbyeRequest {
   type: "goodbye";
 }