[FE] Stop ignoring ABSTRACT_MEMBER_NOT_IMPLEMENTED for expect classes

^KT-59739 Fixed
Review: https://jetbrains.team/p/kt/reviews/11038/timeline

compiler/testData/multiplatform/explicitActualOnOverrideOfAbstractMethod/common.kt

@@ -2,4 +2,6 @@ expect abstract class Base {
     abstract fun foo()
 }
 
-expect class DerivedImplicit : Base
+expect class DerivedImplicit : Base {
+    override fun foo()
+}

compiler/testData/multiplatform/explicitActualOnOverrideOfAbstractMethod/jvm.kt

@@ -3,5 +3,5 @@ actual abstract class Base {
 }
 
 actual class DerivedImplicit : Base() {
-    override fun foo() {}
-}
+    actual override fun foo() {}
+}