removed unused namespace

Author: petesramek

tests/PolylineAlgorithm.Tests/AbstractPolylineDecoderTest.cs

@@ -8,7 +8,6 @@ namespace PolylineAlgorithm.Tests;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using PolylineAlgorithm;
 using PolylineAlgorithm.Abstraction;
-using PolylineAlgorithm.Properties;
 using PolylineAlgorithm.Utility;
 using System;