[Call-for-Review] Fix for bug 119902 (only rename the first master page, the other master pages keep default name when save to .otp)

[Bingbing Ma]

Hi, all

     I had fix a defect: 119902 (
https://issues.apache.org/ooo/show_bug.cgi?id=119902).
     Anyone can help me to review? Thanks!

Best Regards