FIR checker: fix REFERENCE_BY_QUALIFIED positioning strategy to consider callable reference

compiler/testData/diagnostics/tests/callableReference/function/innerConstructorFromClass.fir.kt

@@ -26,9 +26,9 @@ class A {
 
 class B {
     fun main() {
-        <!UNRESOLVED_REFERENCE!>::Inner<!>
+        ::<!UNRESOLVED_REFERENCE!>Inner<!>
         val y = A::Inner
 
         checkSubtype<KFunction1<A, A.Inner>>(y)
     }
-}
+}