[MINOR] make the launcher project name consistent with others

I found this by chance while building spark and think it is better to keep its name consistent with other sub-projects (Spark Project *).

I am not gonna file JIRA as it is a pretty small issue.

Author: WangTaoTheTonic <wangtao111@huawei.com>

Closes #6603 from WangTaoTheTonic/projName and squashes the following commits:

994b3ba [WangTaoTheTonic] make the project name consistent