Fixed bug with cascade opacity for control button.
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3_fix
Merge pull request #6802 from samuele3hu/v3_fix

[ci skip]fix compile error for lua template
Merge pull request #6655 from zifter/FixCascade

Fixed bug with cascade opacity and color for control button. #4881