PR: Fix several bugs with button's title (#19073)，breaks Buttons custom fonts style in cocos studio

[sonyps5201314]

• cocos2d-x version:git v3 latest
• devices test on:win32
• developing environments
  • VS version:vs2017 15.9.4
    Steps to Reproduce:
    cocos studio中的样子：
    
    test_bug.zip

1. 下载附件2
   cpp-empty-test.zip
   ，直接编译运行看到结果，看到出问题的样子（大小缩小了）：
   

2.撤销该提交的更改(UIButton.h,UIButton.cpp),重新编译cocos及程序，就看到正确的样子了。

官方你们说该怎样整？官方升级cocos studio，还是开放cocos studio的源代码,还是修改cocos2dx源代码以修复本问题？

English:
What cocos studio looks like:

1. Download attachment 2, compile and run directly to see the result, and see what the problem looks like (the size is reduced) :
2. Undo the submitted changes(UIButton.h,UIButton.cpp) and recompile cocos and the program, and you will see the correct appearance.
   What do you say the authorities do?Will you officially upgrade cocos studio, open the source code of cocos studio, or modify the source code of cocos2dx to fix this problem?

reference linking：
#19253

PR: http://github.com/cocos2d/cocos2d-x/pull/19073

[PatriceJiang]

@sonyps5201314 please check if this issue fixed with #19260

[sonyps5201314]

测试了，的确是修复了，感谢！