Modify KV.Set to no longer contain version parameter

cmix/message/meteredCmixMessageBuffer.go

@@ -53,8 +53,6 @@ func (*meteredCmixMessageHandler) SaveMessage(kv *versioned.KV, m interface{},
 	}
 
 	// Save versioned object
-	// fixme: this had differing versions in object and set,
-	//  reviewer please confirm this is correct before merge
 	return kv.Set(key, &obj)
 }