fix: 修复 drawpoly(), ege_drawpoly() 在绘制形成多边形的闭合折线时首尾连接处无拐角的情况 #172
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drawpoly() 和 ege_drawpoly() 内部都使用 折线 PolyLine 来实现,。如果直线线帽和直线连接样式为圆角，那么首尾连接处不进行额外处理也是可以正常连接的，但是如果是斜角和尖角的就出问题。
所以这里对首先连接的闭合折线使用 Polygon() 来进行绘制