fix: fix sometime onfinish not invoke

[Aarebecca]

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🔗 Related issue link

💡 Background and solution

camera.gotoLandmark 有一定概率不会执行 onfinish 回调函数

问题原因： requestAnimationFrame 计时误差导致小概率情况下 elapsed === duration 从而不会执行下一帧而无法执行 endAnimation 方法

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camera.gotoLandmark will not execute the onfinish callback with some probability

Cause: a timing error in 'requestAnimationFrame' causes a small probability of 'elapsed === duration' which prevents' endAnimation 'from executing the next frame

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