[FIR, IR] Cleanup: drop unused allowClassActualizationWithWiderVisibility & allowTransitiveSupertypesActualization

These flags were used when ExpectActualMatchingContext was reused in K1.

compiler/ir/ir.actualization/src/main/kotlin/org/jetbrains/kotlin/backend/common/actualizer/IrExpectActualMatchingContext.kt

@@ -41,12 +41,6 @@ internal abstract class IrExpectActualMatchingContext(
     val typeContext: IrTypeSystemContext,
     val expectToActualClassMap: Map<ClassId, IrClassSymbol>
 ) : ExpectActualMatchingContext<IrSymbol>, TypeSystemContext by typeContext {
-    override val allowClassActualizationWithWiderVisibility: Boolean
-        get() = true
-
-    override val allowTransitiveSupertypesActualization: Boolean
-        get() = true
-
     // This incompatibility is often suppressed in the source code (e.g. in kotlin-stdlib).
     // The backend must be able to do expect-actual matching to emit bytecode
     // That's why we disable the checker here. Probably, this checker can be enabled once KT-60426 is fixed