Safe delete: when invoking on expect, delete also relevant actual

Partial fix of KT-15666

idea/testData/refactoring/safeDeleteMultiModule/byHeaderFun/after/JS/src/test/test.kt

@@ -1,9 +1,5 @@
 package test
 
-fun foo(n: Int) {
-
-}
-
 fun test() {
     foo(1)
 }

idea/testData/refactoring/safeDeleteMultiModule/byHeaderFun/after/JVM/src/test/test.kt

@@ -1,9 +1,5 @@
 package test
 
-fun foo(n: Int) {
-
-}
-
 fun test() {
     foo(1)
 }