In HUD, curve radius displays in decimal miles

[Michael Loehr]

Curve radius in North America (when used) is expressed in feet. Typical units for curvature on freight systems is Degree of Curvature.

Using Test Source Build = 0.0.8264.42519 (2022-08-17 23:37:18Z)
   1. Route: BNSF Scenic Sub, Explore Route, manual driver
   2. Route: BNSF Scenic Sub, + Explore in Activity Mode + AI driver enabled

Proposed modification is in line 1151 of HUDWindow.cs to display feet instead of meters when not in metric mode.

From:

   TableSetCell(table, 14, "{0}", FormatStrings.FormatDistance(car.CurrentCurveRadius, car.IsMetric));

To:

  TableSetCell(table, 14, "{0}", FormatStrings.FormatShortDistanceDisplay(car.CurrentCurveRadius, car.IsMetric));