Remove unnecessary lines

Author: cjbj

lib/aqQueue.js

@@ -119,13 +119,11 @@ class AqQueue {
       if (typeof options.payloadType == 'string') {
         const cls = await conn._getDbObjectClassForName(options.payloadType);
         this._payloadTypeClass = cls;
-        this._payloadType = constants.DB_TYPE_OBJECT;
         options.payloadType = cls;
       } else {
         errors.assertParamPropValue(nodbUtil.isObject(options.payloadType) &&
           options.payloadType.prototype instanceof BaseDbObject, 2, "payloadType");
         this._payloadTypeClass = options.payloadType;
-        this._payloadTypeName = options.payloadType.prototype.name;
       }
       this._payloadType = constants.DB_TYPE_OBJECT;
       this._payloadTypeName = this._payloadTypeClass.prototype.name;