[FIR2IR] Make checks about f/o accessors necessity more precise

#KT-43342 Fixed

compiler/testData/ir/irText/firProblems/kt43342.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+open class ControlFlowInfo<K, V>(val map: Map<K, V>): Map<K, V> by map
+
+class StringFlowInfo(map: Map<String, String>): ControlFlowInfo<String, String>(map) {
+    fun foo(info: StringFlowInfo) {
+        keys
+        info.keys
+    }
+}