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

idea/testData/multiModuleLineMarker/fromCommonToJvmImpl/common/common.kt

@@ -1,9 +1,9 @@
 // !CHECK_HIGHLIGHTING
 
-header class Header {
+expect class Header {
     fun foo(): Int
 }
 
-header fun foo(arg: Int): String
+expect fun foo(arg: Int): String
 
-header val flag: Boolean
+expect val flag: Boolean

idea/testData/multiModuleLineMarker/fromCommonToJvmImpl/jvm/jvm.kt

@@ -1,9 +1,9 @@
-impl class <lineMarker>Header</lineMarker> {
-    impl fun <lineMarker>foo</lineMarker>() = 42
+actual class <lineMarker>Header</lineMarker> {
+    actual fun <lineMarker>foo</lineMarker>() = 42
 }
 
-impl fun <lineMarker>foo</lineMarker>(arg: Int) = arg.toString()
+actual fun <lineMarker>foo</lineMarker>(arg: Int) = arg.toString()
 
-impl val <lineMarker>flag</lineMarker> = true
+actual val <lineMarker>flag</lineMarker> = true