Kotlin facet UI, JS: Hide "Enable incremental compilation (experimental)".

This option is project-wide only, so it should be visible only in project settings.
#KT-26095 Fixed.

idea/src/org/jetbrains/kotlin/idea/compiler/configuration/KotlinCompilerConfigurableTab.java

@@ -163,6 +163,7 @@ public class KotlinCompilerConfigurableTab implements SearchableConfigurable, Co
         if (compilerWorkspaceSettings == null) {
             keepAliveCheckBox.setVisible(false);
             k2jvmPanel.setVisible(false);
+            enableIncrementalCompilationForJsCheckBox.setVisible(false);
         }
 
         reportWarningsCheckBox.setThirdStateEnabled(isMultiEditor);