KMP: Put "prohibit member scope mismatch for non-final expect" under the flag

^KT-61668 Fixed

Review: https://jetbrains.team/p/kt/reviews/12062/timeline

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker.kt

@@ -25,6 +25,7 @@ import kotlin.contracts.contract
 
 object ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker : DeclarationChecker {
     override fun check(declaration: KtDeclaration, descriptor: DeclarationDescriptor, context: DeclarationCheckerContext) {
+        if (!context.languageVersionSettings.supportsFeature(LanguageFeature.MultiplatformRestrictions)) return
         val (actual, expect) = matchActualWithNonFinalExpect(declaration, descriptor, context) ?: return
 
         // The explicit casts won't be necessary when we start compiling kotlin with K2. K1 doesn't build CFG properly