[Gradle, JS] True on check exit code in mocha

#KT-37668 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt

@@ -92,7 +92,7 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) :
         return TCServiceMessagesTestExecutionSpec(
             forkOptions,
             args,
-            false,
+            true,
             clientSettings
         )
     }