[Gradle, JS] Remove propagation moduleName from legacy to ir target

#KT-38614 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsTarget.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -47,7 +47,6 @@ constructor(
             check(!isBrowserConfigured && !isNodejsConfigured) {
                 "Please set moduleName before initialize browser() or nodejs()"
             }
-            irTarget?.moduleName = value
             field = value
         }