fix lipsync.h compile error

[mongonta0716]

This is an omission that was corrected when the library was changed to M5Unified.

#76

• [ x ] Bug fix

[mongonta0716]

Updated to M5Unified-compatible audio and talk samples.

[mongonta0716]

Speaker(spk_cfg) may not need it, but as for M5.begin(), beginners are not familiar with M5Unified's Config method, so it is better to write it.

[yoshipon]

Thanks for your rapid reply! I see!!! Kind tutorials are most important :)

[mongonta0716]

Yes, it is. It is indeed hard to understand.

Until the M5Unified's documentation is more solid, I'll try to supplement it with a few comments.