FIR checker: fix REFERENCE_BY_QUALIFIED positioning strategy to consider callable reference

compiler/testData/diagnostics/tests/delegatedProperty/provideDelegate/provideDelegateOnFunctionalTypeWithThis.fir.kt

@@ -13,10 +13,10 @@ fun wrong(arg: Wrong) {}
 class Wrong
 
 class Right {
-    val prop: () -> Unit by <!UNRESOLVED_REFERENCE!>::wrong<!>
+    val prop: () -> Unit by ::<!UNRESOLVED_REFERENCE!>wrong<!>
 }
 
 fun box(): String {
     Right().prop()
     return "OK"
-}
+}