[JS] Don't produce metadata-only (IR-less) KLIBs in JS

The scenario when JS source code is shared between a few JS common
source sets is not supported in Kotlin Multiplatform.

^KT-61136

compiler/tests-common/tests/org/jetbrains/kotlin/klib/AbstractKlibIrTextTestCase.kt

@@ -122,7 +122,6 @@ abstract class AbstractKlibIrTextTestCase : CodegenTestCase() {
             metadataVersion = KlibMetadataVersion.INSTANCE,
             project = project,
             exportKDoc = false,
-            skipExpects = true,
             allowErrorTypes = allowErrors
         )