Fixed conversion factor to eliminate truncation error.

Author: mludlum

UnitsNet.Tests/CustomCode/LengthTests.cs

@@ -33,7 +33,7 @@ public class LengthTests : LengthTestsBase
 
         protected override double FeetInOneMeter => 3.28084;
 
-        protected override double USSurveyFeetInOneMeter => 3.2808333333465;
+        protected override double USSurveyFeetInOneMeter => 3.2808333333;
 
         protected override double InchesInOneMeter => 39.37007874;