[EdgeStyle]: Vertical EdgeStyle should be Swapped

[Afroz-Shaikh]

BUG: Vertical EdgeStyle LinearEdgeStyle.startCurve assign Curve to wrong edge

Description: EdgeStyle LinearEdgeStyle.startCurve assign Curve to endCurve and similarly LinearEdgeStyle.endCurve assign Curve to startCurve When GaugeOrientation is Vertical

Steps to Reproduce:

LinearGauge(
        gaugeOrientation: GaugeOrientation.vertical,
        valueBar: [
          ValueBar(
              value: 50,
              offset: 20,
              borderRadius: 30,
              valueBarThickness: 30,
              position: ValueBarPosition.left,
              edgeStyle: LinearEdgeStyle.startCurve)
        ],
        rulers: const RulerStyle(
            rulerPosition: RulerPosition.right, showPrimaryRulers: true),
      ),

Additonal Information

• This issue occurs in Vertical Orientation
• The issue occurs consistently across different devices and browsers.