[FE] Stop ignoring ABSTRACT_MEMBER_NOT_IMPLEMENTED for expect classes

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

compiler/testData/codegen/box/multiplatform/k2/basic/expectActualIntersectionOverride.kt

@@ -13,7 +13,9 @@ interface I2 {
     fun f(): String
 }
 
-expect class C() : I1, I2
+expect class C() : I1, I2 {
+    override fun f(): String
+}
 
 fun test() = C().f()
 
@@ -21,7 +23,7 @@ fun test() = C().f()
 // FILE: platform.kt
 
 actual class C : I1, I2 {
-    override fun f() = "OK"
+    actual override fun f() = "OK"
 }
 
 fun box() = test()