message: refactor: Remove unused KeyIDHasher
diff: @@ -148,17 +148,6 @@ public:
  }
  };
  -class KeyIDHasher
  -{
  -public:
  - KeyIDHasher() {}
  -
  - size_t operator()(const CKeyID& id) const
  - {
  - return id.GetUint64(0);
  - }
  -};
  -
  /*
  * A class implementing ScriptPubKeyMan manages some (or all) scriptPubKeys used in a wallet.
  * It contains the scripts and keys related to the scriptPubKeys it manages.
  