PR nit change

Author: MenelvagorMilsom

Assets/MixedRealityToolkit/Utilities/BuildAndDeploy/UnityPlayerBuildTools.cs

@@ -214,7 +214,7 @@ public static void ParseBuildCommandLine(ref IBuildInfo buildInfo)
                         break;
                     case "-scenes":
                         buildInfo.Scenes = from scene in arguments[++i].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
-                                           select scene.TrimStart().TrimEnd();
+                                           select scene.Trim();
                         break;
                     case "-buildOutput":
                         buildInfo.OutputDirectory = arguments[++i];