FIR: Handle visibility of public setter of protected synthetic property like in K1

K1 allows writing access to a public setter of a protected synthetic
property only if the call is inside a subclass. K2 previously allowed
that unconditionally. This changes brings the behavior in line with K1.

^KT-56050 Fixed

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/SetterHasHigherAccess.fir.kt

@@ -5,8 +5,8 @@ import JavaClass
 
 fun foo(javaClass: JavaClass) {
     val v = javaClass.<!INVISIBLE_REFERENCE!>something<!>
-    javaClass.something = 1
-    javaClass.<!INVISIBLE_REFERENCE!>something<!>++
+    javaClass.<!INVISIBLE_REFERENCE!>something<!> = 1
+    javaClass.<!INVISIBLE_REFERENCE, INVISIBLE_REFERENCE!>something<!>++
 }
 
 // FILE: JavaClass.java