fix installintegration headless install test

Author: vkovec

Assets/FbxExporters/Editor/UnitTests/IntegrationsTest.cs

@@ -41,7 +41,7 @@ public void BasicTest() {
                 LogNonEmptyString ("display name", mayaIntegration.DccDisplayName);
                 LogNonEmptyString ("integration zip path", mayaIntegration.IntegrationZipPath);
 
-                Assert.IsFalse (Editor.MayaIntegration.IsHeadlessInstall ());
+                Assert.IsFalse (Editor.MayaIntegration.IsHeadlessInstall () == 0);
 
                 LogNonEmptyString ("module template path", mayaIntegration.GetModuleTemplatePath ());
                 LogNonEmptyString ("package path", Editor.MayaIntegration.GetPackagePath ());