Migration: header->expect & impl->actual in IDEA test data

idea/testData/multiModuleQuickFix/memberValToExtensionByImpl/js/js.kt

@@ -1,5 +1,5 @@
 // "Convert member to extension" "true"
 
-impl class Foo {
-    impl val <caret>foo get() = 1
+actual class Foo {
+    actual val <caret>foo get() = 1
 }

idea/testData/multiModuleQuickFix/memberValToExtensionByImpl/js/js.kt.after

@@ -1,6 +1,6 @@
 // "Convert member to extension" "true"
 
-impl class Foo {
+actual class Foo {
 }
 
-impl val Foo.foo get() = 1
+actual val Foo.foo get() = 1