revert: 变更了sparkline的曲线生成算法，避免出现线条超出上下边界的问题 #86

[Aarebecca]

• revert refactor(sparkline): 变更了sparkline的曲线生成算法，避免出现线条超出上下边界的问题 #86
• use newly catmullRom2Bezier method

[coveralls]

Pull Request Test Coverage Report for Build 1315603365

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 77.746%

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Files with Coverage Reduction	New Missed Lines	%
src/ui/sparkline/path.ts	1	96.43%

Totals
Change from base Build 1283183488:	-0.2%
Covered Lines:	3097
Relevant Lines:	3717

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💛 - Coveralls