Enabled ConcatenateQueryStrings unit test for EditorMeasurement

Change-Id: Iec62a81075533f4d815eaf6a553dd2a2bae8af67

Author: Stewart Miles

source/VersionHandlerImpl/unit_tests/src/EditorMeasurementTest.cs

@@ -149,7 +149,7 @@ private EditorMeasurement CreateEditorMeasurement() {
         /// Concatenate query strings.
         /// </summary>
         [Test]
-        void ConcatenateQueryStrings() {
+        public void ConcatenateQueryStrings() {
             Assert.That(EditorMeasurement.ConcatenateQueryStrings(null, null), Is.EqualTo(null));
             Assert.That(EditorMeasurement.ConcatenateQueryStrings("foo", null), Is.EqualTo("foo"));
             Assert.That(EditorMeasurement.ConcatenateQueryStrings(null, "foo"), Is.EqualTo("foo"));