[JS IR] Adapt stepping tests for Kotlin/JS

compiler/testData/debug/stepping/simpleDefaultArgWithInline.kt

@@ -15,7 +15,7 @@ fun box(): String {
 }
 
 // FORCE_STEP_INTO
-// EXPECTATIONS
+// EXPECTATIONS JVM JVM_IR
 // test.kt:13 box
 // test.kt:4 box
 // test.kt:5 box
@@ -24,3 +24,5 @@ fun box(): String {
 // test.kt:9 ifoo2
 // test.kt:8 ifoo2$default (synthetic)
 // test.kt:14 box
+
+// EXPECTATIONS JS_IR