Fix outline shader effect only works in the openGL(legacy).

[andy840119]

Will have glitch if using other renderer.
I have no idea why it's happened and how to fix ;_;

[andy840119]

Note:
It's hard to reproduce in this repo.
Maybe it's because only have one lyric in the test scene?

Maybe should make the test scene with 2 or more lyrics at the same time?
Not very sure the vertex point is affected if have more than 1 lyrics?

[andy840119]

Guess have issue with the top-left point 🤔

[andy840119]

Note:

1. It's easier to happened in the release lazer client(100% happened) and test scene with release build(50~80% happened)
2. Not easy to reproduce in the font project(with debug/release build) and main project(debug build.)