Should re-calculate the transforms if change the shader in the karaoke sprite text.

[andy840119]

Remain issue in the #157
Found in the karaoke-dev/karaoke#1293

Should re-calculate the transforms if change the shader in the karaoke sprite text.

[andy840119]

Should write test case to show if RefreshStateTransforms has been triggered.

Maybe it's able to add in the TestSceneKaraokeSpriteText.
Also, not really sure should let this shit to inherit the BackgroundGridTestScene and TestSceneLyricSpriteText. -> Note that BackgroundGridTestScene is for testing if shader affect the background.

[andy840119]

Or should write a new test case to check the invalidate state?

[andy840119]

Fixed.