Unused symbol: don't suggest actual declaration used in another platform

Related to KT-17512
Related to KT-15666

idea/testData/multiModuleQuickFix/safeDeleteUsedInAnotherPlatform/common/common.kt

@@ -0,0 +1,3 @@
+expect class My constructor() {
+    fun foo()
+}

idea/testData/multiModuleQuickFix/safeDeleteUsedInAnotherPlatform/common/common.kt.after

@@ -0,0 +1,3 @@
+expect class My constructor() {
+    fun foo()
+}