Fixed KT-6056 Smart completion does not filter out inaccessible declarations

#KT-6056

idea/testData/completion/smart/InaccessibleDeclarations.kt

@@ -0,0 +1,16 @@
+class A {
+    public val publicVal: Int = 1
+    protected val protectedVal: Int = 2
+    private val privateVal: Int = 3
+
+    public fun publicFun(): Int = 4
+    private fun privateFun() = 5
+}
+
+val p: Int = A().p<caret>
+
+// EXIST: publicVal
+// ABSENT: protectedVal
+// ABSENT: privateVal
+// EXIST: publicFun
+// ABSENT: privateFun