[MPP] Set .isExpect when deserializing a ClassConstructorDescriptor

This will fix expect/actual matching for class constructors
when dependsOn modules are deserialized.

^KT-50120 Verification Pending

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/MemberDeserializer.kt

@@ -277,7 +277,7 @@ class MemberDeserializer(private val c: DeserializationContext) {
             ProtoEnumFlags.descriptorVisibility(Flags.VISIBILITY.get(proto.flags))
         )
         descriptor.returnType = classDescriptor.defaultType
-
+        descriptor.isExpect = classDescriptor.isExpect
         descriptor.setHasStableParameterNames(!Flags.IS_CONSTRUCTOR_WITH_NON_STABLE_PARAMETER_NAMES.get(proto.flags))
 
         return descriptor